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[tunnie]

how old is the coolant? I personally would be tempted to flush the whole coolant system (with heaters on full) with clear water, then run 50/50 mix through as per my maint guide. It does waste a little coolant, but it ensures you have a good 50/50 mix around the entire system.

Keep that oil cooler and head gasket happy 

If you flush with water until it's clear then add 5 litres neat when filling you know the concentration will be right without wasting any.

Kevin

True, thats a much better way. But i recall the coolant system on 4pots is slightly smaller, think thats why i did it the way i did  :-/

how old is the coolant? I personally would be tempted to flush the whole coolant system (with heaters on full) with clear water, then run 50/50 mix through as per my maint guide. It does waste a little coolant, but it ensures you have a good 50/50 mix around the entire system.

Keep that oil cooler and head gasket happy 

If you flush with water until it's clear then add 5 litres neat when filling you know the concentration will be right without wasting any.

Kevin

May well do that TBH Tunnie.

There is no doubt in my mind that this car has been seriously neglected by it's previous, (2nd) owner.

HG & Oil Cooler failures are caused by poor coolant maintenance, for the minimal cost, its worth it