Engine oil Mobil or Shell

I've used Rotella T4 15w-40 in my 2008 6.7 Cummins year round in Canada. The ol girl has 700,000km (420,000 freedom units) and she runs like a top.

I use 0w40 Mobil 1 all year round. I live in upstate New York, so our winters can get pretty cold at times, and summers can be in the 90s F for days at a time.

My V70 2.5T is almost at 190k miles. I add about 1 quart of oil between oil changes at 5k intervals and my car has been trouble-free since I purchased it at 107k miles in 2017.

Do not cheap out on oil. I use Mobil 1 high mileage but Castrol is also good.

I've been using Mobil 1 0w-30 AFE in my VN for over 18000 miles now. No issues and runs fine.

I just rolled over 200,000 in my 2011 5.7. I change mine every 5,000 miles with Mobil 1 Full Synthetic High Mileage 0W-20.

Rotella 5w-40, for no other reason than it is good oil that I can use in every internal combustion engine I own, including wet clutches.

Mobil1 V-Twin 20W-50 in all three holes.

I heard you can throw 20W-50 (Synthetic, specifically V-Twin Mobil One brand) in all three holes and have no issues.

Nothing wrong with LiquiMoly, but I personally find Shell Rotella T6 to be better. It is quite a bit cheaper as well.

I stay away from Mobil 1 and Castrol because although they are everywhere they are not as good as they euro synthetics. In Europe they are not even legally considered synthetics. When I drain mobil1 it looks black and the engine is missing a quart...