Engine oil Shell or AMSOIL

So far, though, it appears that engine wear and presence of contaminants, as shown by UOAs, are significantly "better" with Rotella T in my car's engine than they were with any other oil I used, and especially Castrol Syntec 5W-40.

I was running Motul 8100 and got tired of having to pay alot of money and get it shipped, so I did alot of research and found that overall, the Rotella is one of the best oils for the price, so I switched to that. I notice no difference in power, and it costs alot less

And I use a 15W40 diesel oil year round here in the Bay Area, currently Rotella-T, but have used Mobil Delvac 1300, Delo and others.

i always used 15w40. usually shell rotella in all my old diesels. sometimes i used castrol. but it was always 15w40

The only oil I used in my Audi before Amsoil was Mobil 1, and this far surpasses it.

You will not get better, check the results yourself, I gained 9hp and 6 ft lbs of tourqe and increased my gas mileage per tank 35-50 miles.

Rotella T 5/40 syn hopefully going in this weekend after a seafoam treatment. 25 CAD for 4 litres, inexpensive as it gets up here and you can get it at any TSC or truckstop.

But from my experience with it, it has made a difference in several of my vehicles (not only VW).

Personally I would run a higher detergent 40 weight oil such as Rotella synthetic 5W40 than a "high mileage" oil.

i have used Amsoil for going on 10 years with great success. I have never had a problem or failure with anything i have used it in.