Mixing OAT coolant with others

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Failcon

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When I purchased my 1999 TD5 Discovery about 6 months ago it came with a main dealer service and the coolant had been changed and refilled with OAT coolant. I needed to top up because a slight water pump leak had developed and because of the ice and snow I just used Q8 (?) coolant from the local garage that said "suitable for all engines including aluminium". In these days of product liability I am sure (hopeful?) that if they say its suitable for all engines it must be. I then topped up again with another brand that said the same thing.

Now according to the Drivers Handbook this is a *VERY BAD THING* and I should have used water in the absence of OAT and topped up with concentrate when the opportunity arose. Is my expensive LR coolant now trash or has coolant technology moved on in the 11 years since my car was manufactured and the manual written.

Thanks
 
Depends how much of the Q8 coolant you put in.

More than a cupful and I'd suggest changing it all.

The main benefit of the OAT stuff is the anti-corrosion properties, very necessary on an aluminium engine. There is no known mixture allowed with OAT, so if you've done that twice then it is necessary to change it all.

50/50 mixture BTW.

Peter
 
my 1999 discovery says only use oat coolant in the hand book and on the head tank but tdi engines run ok on the blue or green stuff dont see why a td5 should have a problem but as said dont mix them and i still use the oat
 
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