I use AMSOIL signature series 0W-30 but the Mobil-1 suggested by others is totally fine — AMSOIL is awesome but is expensive.
I ran Amsoil in my 2002 7.3 for years and it worked well for me.
Valvoline is ok, but that specific oil does not have the rating required for your vehicle. AMSOIL has by far better additives to clean/restore the engine. If you are currently using AMSOIL, then continue using it.
Rotella 5w-40, for no other reason than it is good oil that I can use in every internal combustion engine I own, including wet clutches.
I use Amsoil, all 3 holes.
The Engine oil is proven, the claim about the gearbox oil helping to find neutral easier was true for me, and the primary fluid does just that.
I have amsoil 20/50 in the crank, amsoil primary, and amsoil tranny. It’s the bees knees
Rotella 15w40 for mine. Never an issue and good oil reports for several hundred thousand miles.
Rotella T6 has been good to me.
Any synthetic - I like the Amsoil.
Rotella T5, since the T6 is a bit too expensive for a car that leaks. Also a purolator pure one filter. I am up in Northwest NJ. I change it when the HLAs get noisy. It was 4500 miles for the last one.
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