Engine oil Mobil or Shell

I've been running Rotella t6 and a wix oil filter for years on my 04, 3k miles everytime, and it's currently still running with 245k miles.

Mobil1 is $25 a jug at the Walmart, my Blackstone Labs reports say it would be fine if I wanted to extend it well beyond the factory 6k interval.

I noticed a massive difference switching from 0w-30 to Mobil 1 FS 5w-40 in my NG 93. Engine sounded better, burned WAY less oil, and no noticeable fuel economy or power difference. I also used Ceratec a few times and that made it feel smoother.

First oil change after filling with T-6 on my 2002 Saab 9-3 (that didn't have a kit on it) I bought with 130k miles on it was really black, almost a bit sludgy. Next few oil changes quickly got better as the detergent broke down sludge in the top end and cleaned the motor up.

Ran quieter on 5-40 heavy duty diesel Mobil 1

Felt more powerful, but that may have been a perception from quieter and smoother power. Others on Saabnet reported the same.

If you're oil change is specified for longer, buy Mobil 1 in the correct spec grade and change it then, you will save money and use less, which will keep your cash in your pocket not the oil industry's.

I used Rotella T6 for the past few years and no issues

Make sure to use dexos GM approved oil or that thing will start making weird noises. I’ve only used Mobil 1 and not had any issues. Stay away from the cheapest stuff. You might regret it later.

Mobil 1. Used to be a valvoline guy but my motor blew up lol. Dont think brand had anything to do with it, just felt like shaking things up.

Motul. Really anything except Mobil 1, that shit kills EJ’s.