Rodger
True Classic
I was looking at Allison's website and they recommend Motul 5.1 brake fluid for their big brake kit that I have for my K20 swap. I had not heard of 5.1, but saw that it is not silicone based like DOT 5 and is compatible with DOT 3 and 4. I found Bosch ESI 6 Extended Service brake fluid at my local Autozone. The container says that it is compatible with DOT 3, 4 and 5.1. It has a wet boiling point of 365 deg F. It says it lasts 100% longer than DOT 3, 50% longer than DOT 4, and 10% longer than DOT 5.1. Seems like a good choice for a car that I will keep for a long time and not drive a lot. Anyone have knowledge or an opinion? Thanks.