Rotella T5, up to 14k in between changes per oil analysis. Great oil, never had any issues.
I've used Rotella T4 15w-40 in my 2008 6.7 Cummins year round in Canada. The ol girl has 700,000km (420,000 freedom units) and she runs like a top.
Been using the Motul 7100 4t.. My 390 is flawless till now even after 38k kms.
Rotella 5w-40, for no other reason than it is good oil that I can use in every internal combustion engine I own, including wet clutches.
Rotella 15w40 for mine. Never an issue and good oil reports for several hundred thousand miles.
Have been using Motul 5w30 for many years now...
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.
Dt 40… also use motul xcess gen 2 in the 986, the cayenne and a couple of bimmers. Blackstone reports look g great with all of them.
I do have slight oil loss but I also track my car several times a year so it's to be expected. Recently switched to 5w-40 motul so we'll see how that does.
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