Post #10
The DOT levels are one of the most often misunderstood ratings on fluids, they don't mean what people think. People think that 5 is better than 4, and 5.1 is the best.
As 24seven said, DOT5 is completely different and should never go anywhere near your car. The*specification* for DOT5.1 says it can go to a higher temperature, but that doesn't mean that one specific fluid can go to a higher temp than another.
I always used RBF660 fluid when I needed a high temp fluid, but that was technically a DOT4, but a very good expensive one which I never managed to boil.
I.e. don't think that just because it's DOT5.1 that means it can handle higher temperatures - read the individual manufacturer spec for the fluid, but a better DOT4 is far better than a cheap 5.1.
Analogise it to sun creams - in theory, a £1 supermarket own brand Factor 30 offers you better protection than a £15 Nivea factor 15 because it has a higher number. However in reality it'd be useless watered down crap, and the more expensive factor 15 would be better.
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