Engine oil Shell or Mannol

5k with Rotella T6.

20 years driving modified STIs with zero issues.

Rotella T6 now comes in 10w-30 as well as a 5w-40 both are excellent choices.

I'll always use T6 because it's cheap, available, and damn good oil

I've never had any issue with standard Mannol - my cars have always had it every 5k and I'm pleased with the results.

My Skoda gets fresh mannol every 12 months. No problems so far. It meets the VAG spec so all fine in my opinion.

The interesting part is that the T6 was used to tow a camper from Indiana to the Oregon coast where we are now. It’s interesting to see the viscosity, flashpoint and Moly are higher in the T6 even after towing through the mountains and more miles on the change.

VW recommends 505.01 for fixed service at 15k Km or 507.00 for flexible service at 30k Km. Since our driving condition is harsh, I usually cut those Km in half. Since you were pushing 505.01 at 12k I would recommend you use 507.00 5W30 LongLife for 15k to 18k to be on the safe zone especially if your runs are on highways. I’d highly recommend you check oil from Mannol 507.00, I’ve been using them and they are solid choice. It costs under 3.5k for 5L. You can fill 4.4L at change of oil and top up 200ml at 4,8 and 12k interval

I wouldn’t go with 0W20. Most people thicken the oil up in these when they start getting excessive oil burning. Lots of folks running Rotella 5W40. I ran it for years before I got tired of paying the premium price.

Rotella T6 5w40 in my EJ255, its helped a tad with the leaking until I can get everything apart to seal it all up again.

I've just drained this from my car after 6700 miles. I'm not very impressed TBH. The car burnt about a litre in that time, it usually doesn't use half that