What Oil?

[oldzed]

I think the answer to your queation depends on what condition your engine is in.
My engine was pretty worn out when I got it.

Being a mechanic I had access to lots of different oils.
1. I used a fully synthetic 5w30 castrol oil for cars
It smoked like a tyre on fire and the clutch slipped badly.

2. I used a 10w40 semi synthetic comma oil for cars
It smoked a bit and the clutch slipped badly.

3. I used a cheap mineral 20w50 comma car oil.
it smoked a little and the clutch slipped at high revs/load

I have reringed it and it is running the comma 20w50 as a break in oil .

I thing that I will use a motorcycle oil in future cos gaskets/rings and clutch plates are all more expensive.

[ade woollams]

http://www.ducatimeccanica.com/oil.html

these old bikes where designed to run on old school oils from the 70's, ive always said modern oil aint the way
ive got a mate in the usa that has done now over 150,000 miles with a mk11 shaft and only run on 10/40 gtx ,he pulled the motor apart at 120,000 only to replace the rear tensioner wheel as it had started to break up .the rest of the motor was still sweet

[njwmct]

Castrol Actevo 10/40 - modern oil technology - that will benefit your classic air cooled Kawasaki.