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Wet clutch friction plates often contain a fair amount of copper. I wonder if that's part of it?

The engineers and chemists at Chevron and Mobile probably don't realize the benefits that phosphorus and zinc have to offer. Someone should send them a link to BITOG so they can educate themselves on how to make a quality oil.

Originally Posted By: Dyusik Phosphorus too low for my bikes. Pass until someone is willing to guinea pig their shared sump bike with this oil and shows it is safe. Just bought a new dirt bike this spring and it has seen nothing but Delo 400 SDE so far. 20 hours and counting. I'll let you know...

The new CK-4 specification calls for an increase in oxidation resistance, better wear protection, and better shear stability than the outgoing CJ-4 spec. Doesn't that sound ideal for motorcycle engines? What's not to like? Something we seem to forget is that the new oil is still CJ-4 rated...

Originally Posted By: Garak Originally Posted By: stoan Those Delo numbers are pretty disappointing for someone who has just put this stuff in two trucks. How can an oil this much weaker in additives provide 50% greater protection? Not all additives show up in a $30 VOA. I think you're right...