CK-4 oil

Here is a list of Ford approved oil, the new CK-4 Rotella T6 oil is not on the list. This may be the first time that a change in the letters is a downgrade. Thank you government regulations.
Approved

Just changed mine recently to CK-4 Delo 400.

Just received from Amsoil my order of 5W40 Signature Series MaxDuty diesel oil. It happens to meet CK-4/CJ-4 specs. I checked the spec sheet, am I missing something?

ParkCountry wrote:
Not here. I stick with the CJ-4 (Shell Rotella T6) specified for my 2012 6.7 Power Stroke. There has recently been a bit of suspicion pointed at CK-4, so I'm steering clear of it.

Hope you have already bought the CJ-4 Rotella. If it is in the new bottle it could be CK-4 that was labeled as CJ-4. Go to slide 7 and it will tell when they were putting CK-4 in the bottles but not changing the labeling.Rotella

Stick with a CK-4 API oil and avoid a CK-4/SN oil for now.

Popular 15W40 CK4 oils that do not have reduced Zinc/Phos:

Motorcraft
Connoco Phillips
Rotella
Valvoline Premium Blue

Popular 15W40 CK4/SN oils that have reduced Zinc/Phos because they're dual rated for both Diesel and gas (SN):

Delo
Delvac

I bought some extra cases when Costco discounted the CJ-4 heavily to make the transition to CK-4. I have enough to last me a few years.

Not here. I stick with the CJ-4 (Shell Rotella T6) specified for my 2012 6.7 Power Stroke. There has recently been a bit of suspicion pointed at CK-4, so I'm steering clear of it.