MS3 engine oil

Mazdaspeed 3
So I recently bought a mazdaspeed 3 and I've read that the owners manual calls for 5w-30 oil, however, the guy that I bought the car from has regularly used rotella t6, which is 5w-40. I was wondering if it would be fine on my engine if I were to switch back to 5w-30. The type I had in mind was pennzoil platinum


Speed3 & TWO Hemis
2008.5 Speed3, 2006 Chrysler 300C, 2003 Ram 1500
Pennzoil Platinum 5W-30 is what I use. Remember, synthetic is NOT required, so you can use good ol' conventional. The change interval is the same.


2011 BMW 528i, 2015 Mazda 6, 1995 Nissan Maxima Manual
shell rotella is very good stuff! i recommend you use it for sure.

however, try not to use it EVERY oil change. it's a diesel oil, so it has a lot of detergents to keep your engine clean so it's not good to be running it over and over again.

you can also take a look at motul or liqui moly 5w40 (more expensive, but also very good oil) but rotella is a solid choice for sure.