To add, The safe option would seem to be ethylene glycol from say, Halfords if you are determined just to top up and are unsure if its had `normal` glycol coolant at some time.
My understanding is that if a system has OAT antifreeze in - then a later change is done to ethylene glycol - that the latter can never be fully removed from the system due to its method of inhibiting being leaving a deposit on the alloy.
So it has to stay on Ethylene glycol for the rest of its life.
Edited by oilrag {p} on 26/11/2008 at 12:37
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