Changed my engine oil, as always, used Mobil Delvac 15w/40, cost $1.70 (24 ounces) odometer now at 13,003.5
miles.
The stats on drained oil... 757 miles covered, 32.8 hours of run time, 9.51 gallons of fuel burned. Oil drained was discolored...but nowhere near black. I could go farther than 750 miles between changes, but choose not to.
This scooter runs as well as it ever has, uses/burns no oil... engine is bone dry, no leaks or drips. Always starts quickly, always idles steady.....and has never left me stranded. I think I'll keep doing, what I've been doing......it seems to be working.