Most Suitable Coolant

[Biffdiff42]

I have Rover 3.5v SD1 motor circa 1980 and am wondering which is the most suitable coolant for this engine ?

[Ian Anderson]

Best coolant pure water.

But if you are in cold climate you need an antifreeze.
And most antifreezes also have inhibitors and lubricants for pumps etc.

Ian

[ChrisJC]

Blue antifreeze - 50/50 mix with water.

Chris.

[Biffdiff42]

Thank you, I will go for the blue mixed 50/50 with water as often have quite heavy frosts during the winter

[DaveEFI]

Very important to use the correct anti-freeze all year round - or an inhibitor to prevent corrosion.