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Why not get the proper red stuff? Don't trust the all in one stuff any more as there are so many types nower days. Also there is a Gsf on white hart lane near you, and so is Halfords at Tottenham Hale.
If it mail order, go on eBay and find mannol in the right spec from the something carriage company they are my go to.
lynx
@rhb
Is this stuff genuinely ok for all coolant types (red in a vw passat) and on to mix into what's already i the system?
https://prestone.com/product/prime-all-vehicle/