My van's rear main leaks, crank is worn down and I replaced the seal. Running dino 15w40 slows it down a ton but I can't stand how thick it is when its cold. Love running the 5w40 but I'll never have to worry about the underneath rusting,
I have Rotella synthetic 5w40 and dino 15w40 so I was thinking mixing it 50/50 to help with the rear main leak and still have some synthetic for cold starts. Thoughts?
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