I’ve always done my oil changes used to use nothing but Mobil 1 turbo diesel oil. I’ve since changed to Schaeffers 9000 and will never use anything but. For filters, I’ve always ran oem, whether it’s on my duramax trucks, the Chevy gassers, or even my 6.0 powerstroke. I’ve been thinking of swapping to a Mobil 1 filter on the lml. I don’t trust the quick line places at all. My neighbor even had his oil changed at the dealer till they left the drain plug out after fill up. As soon as he left the lot, the oil pressure light came on and the motor locked up. They bought him a new l31 for his obs.