Ethylene glycol doesn't impart any corrosion protection, it's what gives the coolant it's anti-freeze/anti-boil characteristics. Most OAT coolants contain ethylene glycol unless they are 'corrosion protection only'.
Older coolants used to use silicates, now Organic Acids (most manufacturers have dropped the word acid) for the corrosion protection.
Very confusing and many manufacturers don't even list the corrosion protection type, I had to phone a number of suppliers some years back.
Lots of acronyms.
IAT Inorganic Additive Technology (silicates)
OAT Organic Acid Technology
HOAT Hybrid Organic Acid Technology
CAT Conventional Additive Technology (silicates)
I'm sure there are others....
The things I've learnt in recent years are :-
Colour only tells you what dye they used.
Mix at the recommended concentration otherwise you compromise the corrosion protection.
Don't mix different types.
Change at the recommended interval.
Early OAT was problematic in some older vehicles. Now solved with OAT Type 2
Ethylene glycol is poisonous, some manufacturers use propylene glycol instead. Some Countries have banned ethylene glycol.
Lots of discussions on the forum regarding coolants and many people, like me a few years back, think incorrectly that the corrosion protection comes from the ethylene glycol.
Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
'58 Series II (sold)
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C
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