I'm using Rotella T 5w40 and last oil change at 3,000km it drained like water, and after reading here I now realize that with a shared transmission on my bike the 5w40 is not holding up. I also have a K&N air filter and should start oiling it regularly. I'm thinking of switching to a 15w40 grade oil from now on. I rarely ride when temps are lower than 10c. I've also thought about adding a few ounces of ZDDP zinc to my oil changes but someone said not to do that and that it would do harm. What's the opinion on that, will adding ZDDP help my bike?
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