I believe any good synthetic oil, Penn Plat/ ultra, mobile 1, amsoil, rp, new castrol, can go upto 7000 miles in this engine. Anything more, I think you're pushing it. Remember we only have 5 qrts, some euro cars have 10-12 quarts allowing them to go that longer service intervals.
Cheaper synthetic I wouldn't push past 5000. But one thing that is easily overlooked, you absolutely need a good oil filter to run these higher intervals on the engine.
Very high quality filters that can go 10,000 mile interchange:
Bosch D+ (15,000 mile)
K&N
Royal Purple
Amsoil EAO line
Mobil 1
Puralator Pure One
Cheaper synthetic I wouldn't push past 5000. But one thing that is easily overlooked, you absolutely need a good oil filter to run these higher intervals on the engine.
Very high quality filters that can go 10,000 mile interchange:
Bosch D+ (15,000 mile)
K&N
Royal Purple
Amsoil EAO line
Mobil 1
Puralator Pure One
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