They're all good fluids. As long as you stick to the top tier stuff you'll be okay. I'm going to try out the Project Mu fluid the next time we need to buy fluid. Specs look awesome on paper and it's actually less expensive per/L than the Motul 660 and SRF.
Project Mu = $45/L
Motul 660 = $57.98/L
Castraol SRF = $74.99/L
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