atc200 diesel oil?

[Buckizbrutal]

I was referring more to motors that have been abused before you got your hands on it. I agree yes you should just take the time to warm up your engine. When I received my 200s for $100 it needed a lot of work, cleaning and tuning. I adjusted the valves but they still seemed to tap a little, the rotella seemed to help with that. It didn't fully go away but a lot quieter.

[just ben]

ok I usually stay away from oil threads but I thought I would try to explain why anyone ever used rotella. All motor oils used to have zinc and phospherous(spelling?) in them until some years ago. the diesel oil still had it in it because diesels were emissions exempt until just a couple years ago at which point rotella took it out also. The zinc formed an anti-friction layer on the cam and bearings that pretected the lobes and journals. To get the protection of the zinc now you have to use an additive that is used for "break in" or an off road only "race oil" Brad penn is the only name that comes to mind. Are they safe for a wet clutch? I have no idea. I would just use a quality atv or motorcycle oil unless I were breaking in a new engine or a new cam. The additives are critical to break in a flat tappet cam probably not so much on an atv cam.