M1 ESP is arguably the best oil out there. It does not shear fast, doesnt degrade with 5% fuel dilution.
I run Mobil in all my cars. The regular 0W-40 is cheap and easy to get, as is the 5W-30 ESP for the RS3. Right from Walmart.
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.
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.
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.
Mobil3000 5W-30 even boosted my oil pressure and helped with cooling.
I wouldn't consider M1 4T to be the highest quality oil. It's a pretty standard Group III/IV synth blend with a motorcycle on the label.
Syn 3 is garbage. I typically run mobil 1 full synthetic (twin cam) or motul and motul for other stuff since they have dedicated lines for primary, oil etc.
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