Rotella 15w40 for mine. Never an issue and good oil reports for several hundred thousand miles.
Rotella T6 has been good to me.
Shell Rotella T6. It's marketed as heavy diesel oil, but it meets the exact same specs as mobil 1 full synthetic and just has some extra detergent like diesel oils do.
This oil in OG 9-3 that have the crankcase retrofit kits clean the entire engine very well after a few oil changes getting rid of and preventing any sludge issues. The oil even eliminated some nasty tappet noise due to low oil pressure in my 2002 9-3 after a few seconds when I bought it.
This one was done at the local VW dealership where they added 6L of VW oil and were nice enough to collect a sample of the oil for me to send off to Blackstone. The oil in this sample had higher quantities of wear metals present vs the 3rd sample, but that is to be expected as there were more than twice as many miles on the oil.
I just hit 19k miles on my 2017 390. I ride it like someone stole it. Also thousands of high revving miles on the highway.
I use nothing but Rotella T6 15w-40. It is really good oil and it is cheaper than almost anything else you can use.
Shell Advance Ultra - yung full synthetic. Mahal pero worth it. I change oil every 2.5k - 3k max.
I have been using Shell Rotella T5 for decades in big v twins. Currently 1900cc Statoliner.
Im with all these 5w40 rotella guys, just started running it in my 91 1500 with 145k miles with the 4.3tbi and she loves it, I notice a slight bump in oil pressure for sure.
Everyone has their preferences, at the end of the day it doesn't really matter, just change it regularly. I've used Mobil1, Pennzoil, LiquiMoly, Royal Purple, Rotella and probably a couple others I'm forgetting. No noticeable difference between any of them.
I did use the Shell T6 Rotella 5W40 for 4 OCI's and then got a misfire issue. When my mechanic was going thru the possible symptoms he asked what oil i used. When i told him it's a full synthetic deisel truck oil he shook his head and said that not a good idea. Too thick, and that could have an impact.
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