I use 5W-30 Pennzoil Euro-L, one of the few oils I can easily get with BMW LL-04 for my diesel engine, pair it with a Mahle filter
I buy the Mahle filters off rock-auto $11/each
and the oil from Walmart online, it's like $22/5 quart
I also buy two oil changes at a time to get the free shipping off Walmart's website
I do 5k mile OCI, at 5k I do it myself, when I hit 10k on the CBS I take it into the dealership for the free change. They do use 0W-30 but don't think it hurts to switch back and forth.
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