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I've also heard that you can't use pink/red OAT antifreeze in Rover V8's because the gaskets weren't designed to resist the stuff and gradually get eaten through but don't know if it's true.
I read somewhere about using Fernox Alphi 11 intended for central heating systems, it works in houses, has a long lifespan and I know some Rolls-Royce owners use it so it must do the job in a car - any thoughts guys?
I've never had a problem using a decent quality anti-freeze, designed for ally engines. I had the water pump off recently, and the water jacket looked spotless. On a high miles 30 odd year old engine.
There appear to be two Granville Sub-Zero specs, and the blue one says suitable for ally engines. Going back years, BlueCol was for iron block engines, the ally stuff was green.
Rover SD1 VDP EFI
Tech Edge 2Y
I was using the blue Sub-Zero, I'll try a different brand and see what happens.