What kind of oil do you use?

[TehMonkay]

I'm sorry, it is 15-w40

Originally Posted by C. Ludwig

I recommend either Shell Rotella or Chevron Delo. Both are available in a 15-40w. A while back zinc was removed from all "automobile" engine oils. Zinc is a major part of the additive package that helps protect engine against wear on sliding surfaces. Mostly you think of cam lobes and followers. In a rotary engine there is a high amount of surface are that slides (ie, apex, side, corner seals, oil seal steels). Many, many professional engine builders and hobbyists have seen what can happen as a result of new auto oils not having the same additives as they had just a few years ago. The catch to all this is that "diesel" oils still have the zinc in their package. I've been running Rotella for years without issue. Both the standard and synthetic formulas. If you still have the OMP connected then you'll want to stick with the non-synthetic.

From Chris Ludwig, that's why I started using it.