Best oil on 7.3L ????

[colt32]

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[kystanger]

I dont know about best but I run rotella t6 5-40 and like it.

[Notalent]

I like the Valvoline Blue 15W40 as well as Rotella T.

[OL' OutLaw]

Valvoline Premium Blue is considered to be the best Non-Synthetic, (it's the same as Cummins Premium Blue, and NAPA Blue), and Valvoline Premium Blue Synthetic the best Synthetic.....

Look here and do some reading :

Turbo Diesel Register Tech: Lube Oil, Religion, Specifications and the TDR

[PowerStrokeBren]

I run 5-40 and 15-40 rotella

[rascal]

Amsoil 15-40 Heavy Duty Diesel and Marine

[Justin@DP-Tuner]

I primarily run Delo 400 15w-40, but on a couple of changes I have used Valvoline Premium Blue 15w-40. Both have worked fine for me.

[dentexpowerstroke]

The best oil out there will be schaeffer's for synthetic, dyno oil is all pretty much going to be the same.

[chrgd2000]

I run Delo 400 15w-40 and add a qt of Lucas oil stabilizer at every oil change. Also run a bottle of Diesel Kleen in the fuel tank at fill up. Seems to run a little quieter with both.

[ianstew]

The kind you change every 5k.

Don't use additives.