Synthetic or semi-synthetic Oil Query?

[Pete Logan]

I just use oil that is specified for Diesels. If you want Synthetic, still you should stay with the Diesel formula.

Bruce

Because of the extra cleaning additives ?

I used to use only heavy duty full synthetic diesel in everything, but I've got lazy in recent years - not so easy to find the stuff here. Maybe I should make more of an effort.

[Nessism]

In the US, until recently, diesel engines did not typically use catalysts in the exhaust, thus diesel oil had more beneficial additives which are good for motorcycle engines. Unfortunately for motorcyclists, diesel engine oils have undergone a change recently, due to changes in emissions requirements, which somewhat degrades their performance. They are still better than auto oil though and worth using.