Was just in Walmart and saw the red cap with the CK-4 spec listed on it, most of the diesel oils had it. I was confused so I ended up here. I'm still not sure what was the best to buy in this situation, I went with the motorcraft. It's hard to imagine that was a bad choice, I'm going to have to figure this out before the next oil change. My wife is going to love this �� I wasn't planning in it, but I might have to renew my membership and go back to Amsoil like I was using years ago in a different truck. I'm concerned with switching at this stage of the game on a new rig with unknown history though. Why can't they leave stuff alone!?
They can't leave things alone because it's a moving target. CK-4 is just the latest evolution of oil specs to comply with increasing strangulation of emissions systems. Less phosphorus, cleaner DPF's and air.
That being said, no reason to switch to AmSoil unless you want it. Rotella currently meets the spec, many other oils do as well. Wal-Mart has it, farm supply stores, all the auto parts chains.
Delo has products that meet the spec, CJ-4 400LE, and the 15w30 Severe Duty.
Any CJ-4 is fine. There is a bunch of the Valvoline out there still, both 5w and 15w 40's. Your local Cat or JohnDeere dealer would be another source of CJ-4.
Every other manufacturer is supporting CK-4: Cummins, DMax, Navistar, Volvo. Literally every OTR, heavy duty, and backyard tractor manufacturer is moving on with CK-4, but Ford has a special metal in the valvetrain that is wearing away with these oils? In a mature design engine? And with CK-4 being announced well in advance, and a long time in development? Seriously? This is a Ford thing, not a Chevron, Shell, Valvoline, Citgo, Mobil thing.
Ford has always had a goofy attitude toward fluid recommendations. The 6.7 is no different. What I can't wrap my mind around is their requirement of a 40 weight with any percentage of bio fuel, when the 30 weights are just so stout, and so good. The Scorpion is filled with 10w30 from the factory. Are we really expected to believe the plant has 100% petroleum diesel at assembly, and that the dealer changes the oil to a 40 weight at delivery to support the states that require a % of bio fuel in diesel as part of a state program. But the end user is expected to have this little detail in place if there is a question on warranty? I call bovine scat.
But to keep them happy, my choice is Valvoline Premium Blue, CJ-4, 15w40.
9.99 a gallon at Menards.