Coolant - Revision history

Lithopsian: /* Brands and codes */ many Japanese blue coolants are PHOAT

2026-03-17T18:18:53Z

Brands and codes: many Japanese blue coolants are PHOAT

← Older revision		Revision as of 18:18, 17 March 2026
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	*'''HOAT''': Comma/Glysantin G05 (yellow, with sodium benzoate and nitrites) BMW LC-87 (blue), Comma/Glysantin G48 (blue/green, with silicates), Halfords NAP-free (= Comma G48), Citroen/Peugeot/Opel/G33 (blue)		*'''HOAT''': Comma/Glysantin G05 (yellow, with sodium benzoate and nitrites) BMW LC-87 (blue), Comma/Glysantin G48 (blue/green, with silicates), Halfords NAP-free (= Comma G48), Citroen/Peugeot/Opel/G33 (blue)
	*'''OAT''', VW G12 TL 774D (red), VW G12+ TL 774F (pink), Comma Super Longlife Red (red), Halfords OAT (red), Comma/Glysantin G30 (violet), Glysantin G33 (blue/green), Glysantin G34 (orange), ECP Triple QX Red (red), ECP Triple QX Orange (orange), Havoline XLC (orange), Granville Zerocol (red), Bluecol 5yr (red), old Renault Type D (yellow-green)		*'''OAT''', VW G12 TL 774D (red), VW G12+ TL 774F (pink), Comma Super Longlife Red (red), Halfords OAT (red), Comma/Glysantin G30 (violet), Glysantin G33 (blue/green), Glysantin G34 (orange), ECP Triple QX Red (red), ECP Triple QX Orange (orange), Havoline XLC (orange), Granville Zerocol (red), Bluecol 5yr (red), old Renault Type D (yellow-green)
	*'''P-OAT/PHOAT''': Honda Type 2 (blue), Renault Type E (blue)		*'''P-OAT/PHOAT''': Honda Type 2 and many other Japanese (blue), Renault Type E (blue), Toyota Super Long life (pink or blue)
	*'''Si-OAT''': VW G12++ TL 774G (pink), VW G13 TL 774J (purple, with glycerin), ECP Triple QX Purple (purple, with glycerin), Havoline QFC (red, with glycerin), BMW LC-18 (green), Glysantin G40 (violet), new Renault Type D (yellow-green)		*'''Si-OAT''': VW G12++ TL 774G (pink), VW G13 TL 774J (purple, with glycerin), ECP Triple QX Purple (purple, with glycerin), Havoline QFC (red, with glycerin), BMW LC-18 (green), Glysantin G40 (violet), new Renault Type D (yellow-green)
	*'''PSi-OAT''': VW G12EVO (pink), Glysantin G64 (green), Glysantin G65 (=G64, but pink)		*'''PSi-OAT''': VW G12EVO (pink), Glysantin G64 (green), Glysantin G65 (=G64, but pink)

Lithopsian: /* Colours */ blue is increasingly PHOAT

2026-03-17T18:17:35Z

Colours: blue is increasingly PHOAT

← Older revision		Revision as of 18:17, 17 March 2026
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	*'''Violet''' or '''lilac''': usually Si-OAT or PSi-OAT, to G12++ or G12 EVO standard, although Comma/Halfords sometimes describe their G30 as violet		*'''Violet''' or '''lilac''': usually Si-OAT or PSi-OAT, to G12++ or G12 EVO standard, although Comma/Halfords sometimes describe their G30 as violet
	*'''Purple''': glycerin-based Si-OAT to G13 standard		*'''Purple''': glycerin-based Si-OAT to G13 standard
	*'''Blue''', '''blue-green''': may be IAT or lobrid OAT ~~(common for European and Japanese OEM coolants)~~		*'''Blue''', '''blue-green''': may be IAT, lobrid OAT, or PHOAT
	*'''Green''': may be IAT or P(H)OAT (usually Japanese), or Si-OAT (BMW/Toyota HT-12)		*'''Green''': may be IAT or P(H)OAT (usually Japanese), or Si-OAT (BMW/Toyota HT-12)

Lithopsian: /* Colours */ Toyota red is HOAT

2026-03-17T18:00:25Z

Colours: Toyota red is HOAT

← Older revision		Revision as of 18:00, 17 March 2026
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	*'''Yellow''': G05-type lobrid ("heavy duty"), or "universal" (eg. Prestone), or plain OAT (eg. many trucks)		*'''Yellow''': G05-type lobrid ("heavy duty"), or "universal" (eg. Prestone), or plain OAT (eg. many trucks)
	*'''Yellow-green''': probably Renault type D, used to be plain OAT, now Si-OAT (some POAT "green" coolants are pale and yellowish)		*'''Yellow-green''': probably Renault type D, used to be plain OAT, now Si-OAT (some POAT "green" coolants are pale and yellowish)
	*'''Red''': usually plain OAT, sometimes 2-EHA-based, often more complex carboxylic acids or mixtures, to G12 or G12+ standard (note that OEM Toyota coolant for very old models is red ~~and IAT~~)		*'''Red''': usually plain OAT, sometimes 2-EHA-based, often more complex carboxylic acids or mixtures, to G12 or G12+ standard (note that OEM Toyota coolant for very old models is red HOAT)
	*'''Pink''': usually an OAT that is safe to mix with other types of coolant, may be Si-OAT or PSi-OAT, to G12+, G12++, or G12 EVO standard, but Japanese (eg. Toyota) pink coolant is PHOAT		*'''Pink''': usually an OAT that is safe to mix with other types of coolant, may be Si-OAT or PSi-OAT, to G12+, G12++, or G12 EVO standard, but Japanese (eg. Toyota) pink coolant is PHOAT
	*'''Violet''' or '''lilac''': usually Si-OAT or PSi-OAT, to G12++ or G12 EVO standard, although Comma/Halfords sometimes describe their G30 as violet		*'''Violet''' or '''lilac''': usually Si-OAT or PSi-OAT, to G12++ or G12 EVO standard, although Comma/Halfords sometimes describe their G30 as violet

Lithopsian: /* Lotus */ Toyota-Elises

2026-03-17T17:59:28Z

Lotus: Toyota-Elises

← Older revision		Revision as of 17:59, 17 March 2026
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	Either IAT or OAT coolants can be used in the Elise S1. The important thing is not to mix them, and to flush the system if changing from one to the other. Modern OAT coolants ("pink", G12+/++, G30, etc) are more forgiving about being mixed with other types. A HOAT coolant (Unipart AFC, blue) was briefly listed as the official coolant for the K-series in the MGF around 2000. Check the levels regularly and refresh at the recommended interval.		Either IAT or OAT coolants can be used in the Elise S1. The important thing is not to mix them, and to flush the system if changing from one to the other. Modern OAT coolants ("pink", G12+/++, G30, etc) are more forgiving about being mixed with other types. A HOAT coolant (Unipart AFC, blue) was briefly listed as the official coolant for the K-series in the MGF around 2000. Check the levels regularly and refresh at the recommended interval.

	===Elise S2===		===Elise S2/3===
	Rover engined cars use the same coolant as the S1.		Rover engined cars use the same coolant as the S1. The recommended coolant for Toyota-engined cars is Havoline XLC.

	===Evora===		===Evora===

Lithopsian: /* Elise S1 */ Unipart AFC is (was) blue

2026-03-17T17:30:17Z

Elise S1: Unipart AFC is (was) blue

← Older revision		Revision as of 17:30, 17 March 2026
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	The Elise S1 contains a Rover K-series cast aluminium engine. The Elise S1 owner's handbook recommends only using Unipart Superplus, which was green, and a change interval of two years. Unipart Superplus is no longer available, but similar non-OAT coolants are. The "official" Xpart coolant for the K-series engine is now a red OAT coolant, available [https://www.eliseparts.com/products/show/84/608/lotus-approved-engine-coolant/ at EliseParts]. Many S1's have been switched to the red OAT type at some stage of their lives, which should last approximately 5 years before needing to be changed, although the official Lotus service interval is 4 years.		The Elise S1 contains a Rover K-series cast aluminium engine. The Elise S1 owner's handbook recommends only using Unipart Superplus, which was green, and a change interval of two years. Unipart Superplus is no longer available, but similar non-OAT coolants are. The "official" Xpart coolant for the K-series engine is now a red OAT coolant, available [https://www.eliseparts.com/products/show/84/608/lotus-approved-engine-coolant/ at EliseParts]. Many S1's have been switched to the red OAT type at some stage of their lives, which should last approximately 5 years before needing to be changed, although the official Lotus service interval is 4 years.

	Either IAT or OAT coolants can be used in the Elise S1. The important thing is not to mix them, and to flush the system if changing from one to the other. Modern OAT coolants ("pink", G12+/++, G30, etc) are more forgiving about being mixed with other types. A HOAT coolant (Unipart AFC) was briefly listed as the official coolant for the K-series in the MGF around 2000. Check the levels regularly and refresh at the recommended interval.		Either IAT or OAT coolants can be used in the Elise S1. The important thing is not to mix them, and to flush the system if changing from one to the other. Modern OAT coolants ("pink", G12+/++, G30, etc) are more forgiving about being mixed with other types. A HOAT coolant (Unipart AFC, blue) was briefly listed as the official coolant for the K-series in the MGF around 2000. Check the levels regularly and refresh at the recommended interval.

	===Elise S2===		===Elise S2===

Lithopsian: /* Elise S1 */ coolant service interval 4 years

2026-03-17T17:28:48Z

Elise S1: coolant service interval 4 years

← Older revision		Revision as of 17:28, 17 March 2026
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	===Elise S1===		===Elise S1===
	The Elise S1 contains a Rover K-series cast aluminium engine. The Elise S1 owner's handbook recommends only using Unipart Superplus, which was green, and a change interval of two years. Unipart Superplus is no longer available, but similar non-OAT coolants are. The "official" Xpart coolant for the K-series engine is now a red OAT coolant, available [https://www.eliseparts.com/products/show/84/608/lotus-approved-engine-coolant/ at EliseParts]. Many S1's have been switched to the red OAT type at some stage of their lives, which should last approximately 5 years before needing to be changed.		The Elise S1 contains a Rover K-series cast aluminium engine. The Elise S1 owner's handbook recommends only using Unipart Superplus, which was green, and a change interval of two years. Unipart Superplus is no longer available, but similar non-OAT coolants are. The "official" Xpart coolant for the K-series engine is now a red OAT coolant, available [https://www.eliseparts.com/products/show/84/608/lotus-approved-engine-coolant/ at EliseParts]. Many S1's have been switched to the red OAT type at some stage of their lives, which should last approximately 5 years before needing to be changed, although the official Lotus service interval is 4 years.

	Either IAT or OAT coolants can be used in the Elise S1. The important thing is not to mix them, and to flush the system if changing from one to the other. Modern OAT coolants ("pink", G12+/++, G30, etc) are more forgiving about being mixed with other types. A HOAT coolant (Unipart AFC) was briefly listed as the official coolant for the K-series in the MGF around 2000. Check the levels regularly and refresh at the recommended interval.		Either IAT or OAT coolants can be used in the Elise S1. The important thing is not to mix them, and to flush the system if changing from one to the other. Modern OAT coolants ("pink", G12+/++, G30, etc) are more forgiving about being mixed with other types. A HOAT coolant (Unipart AFC) was briefly listed as the official coolant for the K-series in the MGF around 2000. Check the levels regularly and refresh at the recommended interval.

Lithopsian: /* Brands and codes */ G64 = G65

2026-03-17T17:25:45Z

Brands and codes: G64 = G65

← Older revision		Revision as of 17:25, 17 March 2026
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	*'''P-OAT/PHOAT''': Honda Type 2 (blue), Renault Type E (blue)		*'''P-OAT/PHOAT''': Honda Type 2 (blue), Renault Type E (blue)
	*'''Si-OAT''': VW G12++ TL 774G (pink), VW G13 TL 774J (purple, with glycerin), ECP Triple QX Purple (purple, with glycerin), Havoline QFC (red, with glycerin), BMW LC-18 (green), Glysantin G40 (violet), new Renault Type D (yellow-green)		*'''Si-OAT''': VW G12++ TL 774G (pink), VW G13 TL 774J (purple, with glycerin), ECP Triple QX Purple (purple, with glycerin), Havoline QFC (red, with glycerin), BMW LC-18 (green), Glysantin G40 (violet), new Renault Type D (yellow-green)
	*'''PSi-OAT''': VW G12EVO (pink), Glysantin G64 (green), Glysantin G65 (pink)		*'''PSi-OAT''': VW G12EVO (pink), Glysantin G64 (green), Glysantin G65 (=G64, but pink)

	==Lotus==		==Lotus==

Lithopsian: /* Colours */ not always violet (just the concentrate?)

2026-03-17T17:22:51Z

Colours: not always violet (just the concentrate?)

← Older revision		Revision as of 17:22, 17 March 2026
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	*'''Red''': usually plain OAT, sometimes 2-EHA-based, often more complex carboxylic acids or mixtures, to G12 or G12+ standard (note that OEM Toyota coolant for very old models is red and IAT)		*'''Red''': usually plain OAT, sometimes 2-EHA-based, often more complex carboxylic acids or mixtures, to G12 or G12+ standard (note that OEM Toyota coolant for very old models is red and IAT)
	*'''Pink''': usually an OAT that is safe to mix with other types of coolant, may be Si-OAT or PSi-OAT, to G12+, G12++, or G12 EVO standard, but Japanese (eg. Toyota) pink coolant is PHOAT		*'''Pink''': usually an OAT that is safe to mix with other types of coolant, may be Si-OAT or PSi-OAT, to G12+, G12++, or G12 EVO standard, but Japanese (eg. Toyota) pink coolant is PHOAT
	*'''Violet''' or '''lilac''': usually Si-OAT or PSi-OAT, to G12++ or G12 EVO standard, although Comma/Halfords describe their G30 as violet		*'''Violet''' or '''lilac''': usually Si-OAT or PSi-OAT, to G12++ or G12 EVO standard, although Comma/Halfords sometimes describe their G30 as violet
	*'''Purple''': glycerin-based Si-OAT to G13 standard		*'''Purple''': glycerin-based Si-OAT to G13 standard
	*'''Blue''', '''blue-green''': may be IAT or lobrid OAT (common for European and Japanese OEM coolants)		*'''Blue''', '''blue-green''': may be IAT or lobrid OAT (common for European and Japanese OEM coolants)

Lithopsian: /* Colours */ violet or pink

2026-02-11T15:36:18Z

Colours: violet or pink

← Older revision		Revision as of 15:36, 11 February 2026
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	*'''Red''': usually plain OAT, sometimes 2-EHA-based, often more complex carboxylic acids or mixtures, to G12 or G12+ standard (note that OEM Toyota coolant for very old models is red and IAT)		*'''Red''': usually plain OAT, sometimes 2-EHA-based, often more complex carboxylic acids or mixtures, to G12 or G12+ standard (note that OEM Toyota coolant for very old models is red and IAT)
	*'''Pink''': usually an OAT that is safe to mix with other types of coolant, may be Si-OAT or PSi-OAT, to G12+, G12++, or G12 EVO standard, but Japanese (eg. Toyota) pink coolant is PHOAT		*'''Pink''': usually an OAT that is safe to mix with other types of coolant, may be Si-OAT or PSi-OAT, to G12+, G12++, or G12 EVO standard, but Japanese (eg. Toyota) pink coolant is PHOAT
	*'''Violet''' or '''lilac''': usually Si-OAT or PSi-OAT, to G12++ or G12 EVO standard		*'''Violet''' or '''lilac''': usually Si-OAT or PSi-OAT, to G12++ or G12 EVO standard, although Comma/Halfords describe their G30 as violet
	*'''Purple''': glycerin-based Si-OAT to G13 standard		*'''Purple''': glycerin-based Si-OAT to G13 standard
	*'''Blue''', '''blue-green''': may be IAT or lobrid OAT (common for European and Japanese OEM coolants)		*'''Blue''', '''blue-green''': may be IAT or lobrid OAT (common for European and Japanese OEM coolants)

Lithopsian: PHOAT not really similar to lobrid HOAT despite the acronym

2026-02-11T15:31:33Z

PHOAT not really similar to lobrid HOAT despite the acronym

← Older revision		Revision as of 15:31, 11 February 2026
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	*'''IAT''', Inorganic Acid Technology. Not actually acids, these are salts of inorganic acids, usually quite alkaline, such as amines, nitrites, phosphates, and silicates. These are the traditional corrosion inhibitors, effective for all metals, and have an engine service life of up to 2 years or 30,000 miles. Some downsides are sludging and rusting from as they quickly lose effectiveness, and water pump damage from silicate precipitation.		*'''IAT''', Inorganic Acid Technology. Not actually acids, these are salts of inorganic acids, usually quite alkaline, such as amines, nitrites, phosphates, and silicates. These are the traditional corrosion inhibitors, effective for all metals, and have an engine service life of up to 2 years or 30,000 miles. Some downsides are sludging and rusting from as they quickly lose effectiveness, and water pump damage from silicate precipitation.
	*'''HOAT''', Hybrid Organic Acid Technology. A confusing term originally used for coolants with inorganic inhibitors that also contained some organic inhibitors, often sodium benzoate rather than a carboxylate, designed to extend the short service life of pure IAT coolants. The term is now sometimes applied to modern coolants such as the silicated OAT group, but these are a very different set of inhibitors.		*'''HOAT''', Hybrid Organic Acid Technology, often called '''Lobrid''' to indicate it being an older technology than hybrids such as P-OAT and Si-OAT. A confusing term originally used for coolants with inorganic inhibitors that also contained some organic inhibitors, often sodium benzoate rather than a carboxylate, designed to extend the short service life of pure IAT coolants. The term is now sometimes applied to modern coolants such as the silicated OAT group, but these are a very different set of inhibitors.
	*'''OAT''', Organic Acid Technology. Again, not acids, but salts of organic acids, such as carboxylates, sebacates, and 2-EHA. These give good protection to ferrous metals and aluminium alloys, but poor for "yellow" metals which use solders. They have a longer service life, typically quoted at 5 years or 100,000 miles. These are not safe for use in older engines which contains brass or copper. Early versions in the US were dogged by reports of corrosion and engine damage, and one of the inhibitors (2-EHA) has been implicated in damage to silicone-based seals and gaskets. Many modern formulations do not use 2-EHA or have very low levels.		*'''OAT''', Organic Acid Technology. Again, not acids, but salts of organic acids, such as carboxylates, sebacates, and 2-EHA. These give good protection to ferrous metals and aluminium alloys, but poor for "yellow" metals which use solders. They have a longer service life, typically quoted at 5 years or 100,000 miles. These are not safe for use in older engines which contains brass or copper. Early versions in the US were dogged by reports of corrosion and engine damage, and one of the inhibitors (2-EHA) has been implicated in damage to silicone-based seals and gaskets. Many modern formulations do not use 2-EHA or have very low levels.
	*'''Si-OAT''', Silicate Organic Acid Technology. "Universal" coolants, safe to be mixed with any other coolant. These are now added to many new European cars.		*'''Si-OAT''', Silicate Organic Acid Technology. "Universal" coolants, safe to be mixed with any other coolant. These are now added to many new European cars.
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	*'''IAT''': VW G11 TL 774C (blue), Comma Super Coldmaster, previously Classic (blue), Halfords Silicate (= Comma Super Coldmaster), ECP Triple QX Blue (blue), Granville Subzero (blue), Bluecol 2yr (blue)		*'''IAT''': VW G11 TL 774C (blue), Comma Super Coldmaster, previously Classic (blue), Halfords Silicate (= Comma Super Coldmaster), ECP Triple QX Blue (blue), Granville Subzero (blue), Bluecol 2yr (blue)
	*'''HOAT''': Comma/Glysantin G05 (yellow, with sodium benzoate and nitrites) BMW LC-87 (blue), Comma/Glysantin G48 (blue/green, with silicates), Halfords NAP-free (= Comma G48), Citroen/Peugeot/Opel/G33 (blue)		*'''HOAT''': Comma/Glysantin G05 (yellow, with sodium benzoate and nitrites) BMW LC-87 (blue), Comma/Glysantin G48 (blue/green, with silicates), Halfords NAP-free (= Comma G48), Citroen/Peugeot/Opel/G33 (blue)
	**'''PHOAT''': Honda Type 2 (blue), Renault Type E (blue)
	*'''OAT''', VW G12 TL 774D (red), VW G12+ TL 774F (pink), Comma Super Longlife Red (red), Halfords OAT (red), Comma/Glysantin G30 (violet), Glysantin G33 (blue/green), Glysantin G34 (orange), ECP Triple QX Red (red), ECP Triple QX Orange (orange), Havoline XLC (orange), Granville Zerocol (red), Bluecol 5yr (red), old Renault Type D (yellow-green)		*'''OAT''', VW G12 TL 774D (red), VW G12+ TL 774F (pink), Comma Super Longlife Red (red), Halfords OAT (red), Comma/Glysantin G30 (violet), Glysantin G33 (blue/green), Glysantin G34 (orange), ECP Triple QX Red (red), ECP Triple QX Orange (orange), Havoline XLC (orange), Granville Zerocol (red), Bluecol 5yr (red), old Renault Type D (yellow-green)
			*'''P-OAT/PHOAT''': Honda Type 2 (blue), Renault Type E (blue)
	*'''Si-OAT''': VW G12++ TL 774G (pink), VW G13 TL 774J (purple, with glycerin), ECP Triple QX Purple (purple, with glycerin), Havoline QFC (red, with glycerin), BMW LC-18 (green), Glysantin G40 (violet), new Renault Type D (yellow-green)		*'''Si-OAT''': VW G12++ TL 774G (pink), VW G13 TL 774J (purple, with glycerin), ECP Triple QX Purple (purple, with glycerin), Havoline QFC (red, with glycerin), BMW LC-18 (green), Glysantin G40 (violet), new Renault Type D (yellow-green)
	*'''PSi-OAT''': VW G12EVO (pink), Glysantin G64 (green), Glysantin G65 (pink)		*'''PSi-OAT''': VW G12EVO (pink), Glysantin G64 (green), Glysantin G65 (pink)