Editing Coolant (section)

===Colours===
Coolants or antifreezes are usually dyed a strong colour.  Originally this was an almost-fluorescent green for easy identification.  Later formulations with different corrosion inhibitors were then dyed different colours, but a universal system has never been adopted.  Colours vary for the same chemical makeup between brands and in different regions of the world, and the same colours may be used for different chemical makeups.

Based on the colour alone, you might be able to take a guess at what the coolant is, but no guarantees:
*'''Orange''': almost always equivalent to GM Dex-Cool, 2-EHA-based
*'''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)
*'''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
*'''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
*'''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)