Compression Ignition Addict
Join Date: Aug 2007
Location: Central Kentucky
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There seems to be alot of different opinions out there, as I recently had the same question.
My FORD manula calls for 75W-140. So I am ordering some Royal Purple, in that weight.
I "heard" there was a TSB to change it, but I can't find it, and I never saw it posted.
2008 Dodge 2500 Mega Ram, 6.7L, 4x4, 3.73s
1997 F-250 HD, PSD, XLT, Off-Road Pkg., 3.55's, E4OD, 4wd, Dana 60 front axle, 3" Sky RSK, 150,000 miles, Tunes by XM, triple Auto Meter Guages, Tymar Intake, Tymar DP, Straight piped, Killed the kitty, 5" Miters, Programs by DP Tuning, Lund visor, Diamond plate bed rails, Delta toolbox, Rollin' on 315/70/17's on some Raceline's.