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Hi,
to be sure, I use the tectalloy coolant that meets the GM spec (marked for Commodore) which is tighter than the AS.
Never buy the stuff that is merely green coloured water (very weak premixed solutions). I've never brought the "brand", but always check the contents are full strength EG (aroung 1000 mg/l).
I have replaced a head on a B230 (1988) it was weeping at 150,000km. May have been related to a faulty coolant cap that meant the level went down and let some air into the system. It never lost more than 1 - 1.5l of coolant however.
Paul
1992 940SE (turbo)
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