2 1/4 diesel coolant type
- Thread starter IDK...
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Same as goes in in the petrol 2 1/4 
Ethylene glycol blue. Change every 2 years
The more modern stuff can attack old style joints eg in the radiator
Ethylene glycol blue. Change every 2 years
The more modern stuff can attack old style joints eg in the radiator
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I'm a 'it doesn't really matter' sort of guy.
Essentially there are 3 main types, Inorganic Additive (Green), Organic Acid (Pink) and Glycol based (Blue)
There are other colours but these are Hybrid types and not really relevant.
Blue (Glycol) is a great rust inhibitor and is good with alluminium engines, when mixed with water it lowers the freezing point to well below -50C .. before IAT and OAT came along it was the dogs danglies.
Ethelyene Glycol is very poisonous, 50ml (a double) will kill an adult and 4ml a cat or dog.
As we don't have leather seals and lead soldered joints any more I'd 'suggest' you use either Blue (EG based) or Green (IAT).
However it's you car, so you choose.
Essentially there are 3 main types, Inorganic Additive (Green), Organic Acid (Pink) and Glycol based (Blue)
There are other colours but these are Hybrid types and not really relevant.
Blue (Glycol) is a great rust inhibitor and is good with alluminium engines, when mixed with water it lowers the freezing point to well below -50C .. before IAT and OAT came along it was the dogs danglies.
Ethelyene Glycol is very poisonous, 50ml (a double) will kill an adult and 4ml a cat or dog.
As we don't have leather seals and lead soldered joints any more I'd 'suggest' you use either Blue (EG based) or Green (IAT).
However it's you car, so you choose.
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- North Shropshire
You do have lead solder in s3 radiators though.. certainly the early ones
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There's your answer then, Blue Etheylene Glycol ....
Bobsticle
De Villes Advocaat
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Or very expensive waterless. It makes you kind of twitchy about leaks. 
I would stick with the old standard - Blue
If you want to change, then the whole system has to be cleared and flushed before use.
Prestone do a Universal, but I think this best kept for the occasional top up.
And my decider. The blue is cheaper - at the moment ...
If you want to change, then the whole system has to be cleared and flushed before use.
Prestone do a Universal, but I think this best kept for the occasional top up.
And my decider. The blue is cheaper - at the moment ...
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- 31,637
- Location
- North Shropshire
Universal is designed as a top up only, isn't it?
