I run Royal Purple 15W40 and a K&N filter. Is that the best setup? I am sure that I could spend hours researching the question and find 500 different answers so instead I decided to start a new thread!
Schaeffer's 7000 15w-40 in everything! The stock 6.0 filtration is crap, no matter what filter you use. Step up to BPD and add the bypass filter. Go 10,000 miles of hard pulling in my F450 without a worry before a change. Have oil analysis to stand behind it. If you are running a synthetic and it is not Schaeffer's then you are just paying too much.
DELO 400 LE for now till I swap back to Mobil 1. OEM filters are the best, even better filtration with a bypass filter kit. IF one oil was the absolute best we all would be answering with the same oil. Your motor will tell you what to run. I've run just about all of them on my 2006. My favorites list has about 5 oils I can find easily and all cost about the same. 272k on the original injectors speaks for my experience choosing oils that work.
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