Engine oil Shell or FUCHS

Everyone in the Oldsmobile community recommends Rotella

My machinist loves it

I use it in my 66

I used to use Castrol GTX 20W50 oil with Bardahl B2 additive, but after some discussion on the Bob is the oil guy forum, I decided to try a lighter oil: Shell Rotella 15W40 without any additive. It feels a bit easier to start and runs great (but it did ran great before). However, the oil pressure is certainly lower

Fuchs Silkolene. Good stuff.

I've used Shell Helix Ultra 5w-40 and 0w-40 in my AQY. (we have cold winters here) Both seem to work well, no additional lifter noises, normal mileage. Engine sounded good even just before this years oil change.

Shell T6 rottella can be found for $10-12 (us) per gallon after sale and rebate. It is worth stocking lol.

Go find some Shell Rotella T6 at Walmart and use that. 5W-40, and it is rated JASO-MA so it's safe for wet clutch applications. I run it in both bikes and my car; it stands up to sheer and fuel dilution well.

Rotella T6. Don't waste your money on special bike oil. I used it in my ninja 250, my sumo, my speed triple. same oil for everything.

You need to run the 507.00 spec oil. I have been running Shell Rotella T6 Heavy Duty Diesel 5W-40 oil. They other one that I want to start using and is more widely recommended is Liqui Moly 4200 Top Tec 5W-30. The reason why I mention this is because the 507.00 spec oils has better lubrication then the other 501 and 506 spec oils. If the wrong spec oil is used it has a tendency to produce premature Cam shaft lobe wear requiring the replacement of the cam shafts.

personally, I'd use Rotella T6. It's a full synthetic oil marketed for diesel engines or "heavy duty" but it's a low saps 5W-40 oil that is perfectly fine to use in a gasoline application.

My 15 S4 has seen 3 oils in <10k miles. The factory fill was Fuchs. Dealer first change was PP Euro and my latest change the other week was with M1. I've run M1 0w40 Euro in my B5 forever and have had 0 issues with it. Saw no reason to not continue running it in the B8.