Engine oil MOTUL or OEM Audi

I use Motul 8100 EcoLite in mine. Paired with the appropriate Motul fluids in the trans and diff, and RBF660 in the brake lines.

Motul 5W-30.

I'm running 10w60 MOTUL 7100, I sit on the revs though, always Tach out!

I recommend Motul and I advise tou to never use RS8, it's a rebarded Xhina brand.

I was at LordCo recently and one of the workers was going off while i was looking at Motul.

Motul 8100 xcess for high mileage. I've had a few subies thrive on this stuff.

I only use Motul in my car, but I only drive enough to really do 2-3 oil changes a year in 3000 mile intervals usually.

Did switched my D400 to Motul 7100 4T 10W-50 @ 8K kms but in a non Bajaj service center.

Difference that I notice:

Engine looks a bit refined and smoother at high speeds or cruising above 70.

On my newer engines that are modified I use motul, older high performance flat tappet engine I use rotella or equivalent. On my daily commuter I use castrol.

I had the same issue on my 2019 A6 3.0 last year. Two times I had to pop into the dealership to have oil removed (no charge) and the issue was due to dilution and short trips.