Diesel oil for a scooter?

[2010Iron883]

I went to amsoil 10w40. 16,000k no issues

[hualien]

Change the oil often (most of our scooters don't have oil filters).  These scooters require very little oil so it cannot be a cost factor, only a hassle factor.  As most scoots are air cooled the oil breaks down more quickly than in an engine that is water cooled.  If the scooter is new, run it for at least 1,500 miles, changing the oil twice as often as the manual says during this time. (The piston rings will need to "set").  After this "break in" period start using full synthetic oil.  If the spark plug appears to foul (sometimes happens), then switch to a blended synthetic oil.  Yes, synthetic oil is by far the best lubricant you can find.

[2010Iron883]

Thicker oil will slow the scoot down a little. I use amsoil 10w40 and have since 1000 k. I also use amsoil gear lube in my rear gears. Amsoil makes a 15w40 but like everyone says it is diesal oil but its full syn. My scoot calls for 15w40 but when i got it i didnt have a license so i rode alot in the winter 4 below zero. 15w40 would have been way to thick at start up. Im at 17,000 k and have had wanderful performance out of my little scoot until i change to the slider wieght and then my stretched belt showed up. Ive not ever replaced my belt so i got good service from it too. My scoot runs as it did from day one off the show room floor and never burns any oil what so ever. Just my thoughts good luck riding and be safe!