If your engine has mods and making some power I'll go with the thick stuff if not I wouldn't worry about it and use mobile1.

 

I've always used Mobil 1 5w20 since I got my car in 07.

 

Yeah, except the engineers aren't the ones making the call. 5w-20 serves one purpose - keeping the EPA happy. 5w-20 is a pretty lightweight oil that offers a minor increase in efficiency in exchange for not protecting moving parts quite as well. 5w-30 will do a better job of protecting. 10w-30 is handy for warmer climates but not necessary for most any modern stock engine.

 

The engineers stand corrected.

 

I'm getting an oil change this week and I'm filling my engine up with 5W-30 just because Otter and Cranswick said so LMFAO.

WOOT WOOT!!!

 

I've always used 30, actually just changed mine and picked up 20 on accident but instead of just using it I returned it for the 30. I'd just go with the 30 and never look back lol

 

^ THIS. The mods have seen the oil question a million times. They know what Mitsubishi recommends. There isn't a huge difference between 5w20 and 5w30 too, so I wouldn't sweat it.

 

This is not true.

5w-20 and 5w-30 both have the same "cold cranking" viscosity/temperature range but the 30weight at operating temperature will protect more against wear than a 20weight, period.

It will depend a lot on your climate and engine operating temperature. Remember oil thins out at higher temperatures. Like Otter said many companies are compromising to meet MPG and EPA standards by just pushing to use an oil weight.