Originally Posted by Chris_B

I have heard that as well. Yet, is it not true. Castrol (a marketing company) does not private label for companies other than car manufacturers, but they would not PL their SRF for anyone. Reading the specs for both will add some clarity. The PFC fluid is made by a chemical company in the UK, just like the majority of the performance and racing brands on the market. Regardless, in the 35+ years since SRF was introduced, other options have been introduced that perform better and are more cost-effective.