I changed oil with 80% Mobil 1 high mileage and 20% Lucas high mileage oil stabilizer in it, did better than just Mobil 1 high mileage 5w20 alone in summer, (very hot temperature).
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.
Amsoil 5w-40 full saps
I found Mobil 1 0W-40 to allow a lot more timing chain and lifter noise, especially at startup but even after, then switched to Castrol Edge 5W-40 and the noise suddenly wasn't there. I've used it ever since.
I just go to crappy Grease Monkey and do full synthetic Mobil 1 for like $100.00. Then I drive home, and double check their work.
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