Quote Originally Posted by namco View Post
The motor calls for 0w20, a thin oil, because not only tight tolerances in the engine itself but also the oil pump. Thicker oil will make the pump not work correctly and thus causing premature engine failure.
Namco, thanks for your contributions, I find them quite revealing.

If you would please, provide some clarification as to your source for the 'tight tolerances' you refer to so much. I am interested in learning both how you know this and what your source is so I can learn this as well as you.

Quote Originally Posted by namco View Post
Would love to hear a mitsubishi certified tech put their .02 in but i doubt amy are on here who are certified to that level....
As has been said earlier, there are Mitsubishi tecs here. I'm not sure they are following this though. Do you mind if I ask why that would matter? I thought the owner's manual gives the details clear enough.

Thanks!