Changed to synthetic and a funny thing happened...
Couple weeks ago, I changed from 10w40 synthetic blend to Amsoil 10w40. 16K miles on the bike, so did not figure was going to be a problem. Per usual with the past 4 changes, emptied 4 quarts in, which technically is slightly too much since it takes 4 liters, but not enough it should cause an issue. I have ridden it approx 300 miles on the new oil, and was happy with the change as it seems to run smoother and the valvetrain is a little quieter.
So the other day it is warming up before I leave for work, and I notice little puffs of smoke coming from the exhaust for the front cylinder. I also see a little oil weeping from the exhaust manifold, just enough to smoke a little. It has never burned any oil before and the manifold has always been dry.
The only thing I could figure was the change with the synthetic oil lubricity was just enough to start causing oil blow-by in that cylinder. I drained the synthetic out and put dino back in, rode it about 20 miles and no problem.
I am wondering now if I had put exactly the amount of oil I was supposed to in of it would have made a difference, or if the front cylinder rings are just too worn to use the synthetic. Anybody else ever run across this?
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2000 Vulcan 750
Re-padded and modded seat
Spline and final drive lube
Flat black repaint
Rear Luggage Rack