Oil viscosity index retention questions

[BuzLightyear]

What I really mean is, check this out...

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

[JimX]

Wow, that's a spot of luck. I was actually looking for this exact article a few months back which I read some time before that but didn't save. All I could remember was basically it was ok to use a high grade car oil in a motorcycle, but I couldn't remember the details.

I ended up using Castrol Formula R for the last 2 oil changes in my bike anyway, basically because of what I remembered of that article. I'm now running the same oil in both car and bike, makes managing my servicing a little easier, by having less spare oil lying around.

I might switch to a thicker grade for summer though on the bike though, it gets pretty bloody hot and the engine revs about 50% higher than the Skyline.