For the last 17 years I've run the recommended Valvoline Blue in all of my Cummins and so far the internals have been spotless when looking inside.
Mobil 1 extended performance 5w30
Owner's Manual recommends 5W40; but says that any oil that meets the VW 502.00 specification is fine. I've used that Mobil1 European Car Formula 0W40 since our two 2009 Mk5's (Jetta and GLI) were new, with no problems. Specifically zero oil use between changes.
mobile super 3000 w0-30 is what i would run if i were you
'03 GX470, had 240K miles when I bought it just over a year ago. Now on my 2nd oil change at 245K miles with Valvoline High Mileage 5W-30 full synthetic and Fram XG3600 filter. It's quiet and doesn't burn or leak oil.
I use Mobil 1 in my RT and it's been good.
Mobil 1 0W20 every 2.5k miles.
Valvoline Advanced with black Wix filter!
I've had my '88 GLI 16V for over 20 years and always used mobil 1 15W50 without issues.
Valvoline 5w-30 full synthetic for good cold starts in winter and a royal purple oil filter for good small particle filtration.
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