Join Date: Nov 2010
Location: Greensboro, NC
Feedback Score: 0 reviews
I was running Rotella T6 5W-40, but that was before CK-4 oils came out. I still had a pretty good stash of CJ-4 oils to work with, but I've only got enough for one more oil change.
I'll steer clear of CK-4 oils. Next time I buy oil, it'll be Schaeffer Supreme 9000™ Full Synthetic Oil 5W-40, it's still CJ-4, for now. If I'm on the road and need oil, I'll stick with the WSS-M2C171-F1 oils with the Motorcraft logo on the bottle.
For filters, here's what I've found...
The absolute most efficient primary lube oil filter you can get for a 7.3 is the Donaldson DBL7405. (intended for a Caterpillar 3406) It's rated at 7 microns nominal, and 15 microns absolute. But this filter gets dented by my front suspension when it flexes, so I don't run it anymore.
The second most efficient filter I can find is the Donaldson P550371, it's rated at 17 microns absolute.
The third best I can find is the OEM Motorcraft FL-1995, according to Ford's website it's 18 microns absolute.
There's a lot of hype about the Wix 51734XE & Napa 1734XE oil filters, but the published beta ratios are 4 @ 10 microns (absolutely incredible) and 75 @ 30 microns (less than mediocre). I'm inclined to think they've mistyped something because that's a wide range of good-to-bad performance in a single filter.
2002 F-250 CCLB 4x4 XLT, 7.3, ZF-6 with Midwest Short-throw shifter, ESOF, 3.73 R&P, HPx line, FRx, Racor prefilter before pump, Amsoil bypass filter, Coolant filter too