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Makes sense. This engine has 97k on it now and appears to be in great shape. I’d love to get 300k out of it, but honestly the rest of the vehicle will probably be a mess by 200-250k given the dirt roads and salt around here. I would like to not have a filthy engine which needs the intake ports...

Gotcha, that’s a good, clear explanation. I was missing the move to ULSD with the (related) roll-out of DPFs, and hadn’t thought of the other oil changes which might be beneficial to an engine running ULSD. My impression - which it sounds like was wrong - is that LL04 oils might be marginally...

I can’t find much information on the differences between ESP and European Formula, other than the ESP is “designed for particulate filters” and is much more expensive. What is the advantage of running ESP in the M57? Less carbon on the intake and valves? Is it actually a better oil...

I am not concerned about a low-SAPs oil to save the DPF.

All, I have recently acquired a BMW X5 with the M57 diesel. It makes north of 350/500 on the current (mild) tune. It’s a family car and gets only moderate abuse of the skinny pedal. I do tow occasionally, usually pretty heavy. I live in the northeast US and see ambient temps from -10F to +90F...