45 gallons lol... that'll hold him over.
That spec is not for the 7.3 nor 6.0. That is for the 6.7 only.Thanks, but as per my OP, Delvac 1 ESP 5W-40 does not meet the required Ford Spec wss-m2c171-f1 for antiwear, ostensibly. It's not listed on the jug, and it is not on Ford's Approved Engine OIl list. Per my OP, only the 0W-40 grade is approved and listed. Not available anywhere I looked.
My question is which of the 3 approved oils is optimal, if any.
That spec is not for the 7.3 nor 6.0. That is for the 6.7 only.
Did Ford officially document that anywhere?
Everything I've seen is that you're correct. The poster that's saying "That spec is not for the 7.3 nor 6.0 that is for the 6.7 only" doesn't understand that the reason for the F1 specification was because of the lower Phosphorus in some of the CK-4 oil that Ford tested was not adequate to minimize upper valve train wear. They may have tested those oils on the 6.7L but Ford back spec'd it to include ALL Power Stroke engines. Nowhere does it say to use the F1 spec "Only in the 6.7L" or "Don't use F1 spec oil in a 7.3, 6.0, or 6.4L." It doesn't exist.That link is to the document that has been discussed many times. In it, they are still saying to use a Ford approved oil for the older trucks.
"Ford continues to recommend motor oils meeting the Ford specification WSS-M2C171-F1instead of CK-4 motor oils in the 3.2L and 6.7L Ford diesel engines as well as older Ford dieselengines, 4.5L, 6.0L, 6.4L, and 7.3L. Testing completed on some CK-4 type formulations haveshown inadequate wear protection compared to CJ-4 formulations developed and licensedbefore 2016. Therefore, Ford has included additional requirements beyond CK-4 in WSSM2C171-F1 to provide additional wear protection."
I have never seen it stated specifically that the new CK4 formulas that have NOT been Ford approved are just fine for older diesels. Always room for doubt and discussion in their statements.
Don't get me wrong, I have used (and continue to use) Moble Delvac 1 ESP 5W40 and Mobil 1 TDT 5W40 in my '06 6.0L. That said, I have never seen any SPECIFIC from Ford that says the new CK4 rated oils are ok WITHOUT the Ford approval for these older engines.
Understood, Nothing new that I'm aware of. When someone makes a claim like that it makes one wonder if there is "New" information. You're right in your understanding. Nothing has changed.Believe me ................. I certainly wasn't wanting to open up the same old debates that have happened a thousand times before. I just thought that it sounded like Ford may have recently offered more (new) information!
If the only concern is the phosphorus content, most CK-4 oils should be fine. CJ-4 and CK-4 both have the same 1200 ppm upper limit for phosphorus. Some CK-4 mixed fleet gasoline/diesel oils target ~800 ppm phosphorus so that they can meet both CK-4 and API SN, and I'd assume that these are the oils that Ford is concerned about.Everything I've seen is that you're correct. The poster that's saying "That spec is not for the 7.3 nor 6.0 that is for the 6.7 only" doesn't understand that the reason for the F1 specification was because of the lower Phosphorus in some of the CK-4 oil that Ford tested was not adequate to minimize upper valve train wear.
Yes, that's why Ford came out with the F1 Specification to discern the difference between ones that have & ones that don't have enough phos. There are still a few VERY popular HDMO that folks buy that don't meet the spec. still on the market shelves being sold.If the only concern is the phosphorus content, most CK-4 oils should be fine. CJ-4 and CK-4 both have the same 1200 ppm upper limit for phosphorus. Some CK-4 mixed fleet gasoline/diesel oils target ~800 ppm phosphorus so that they can meet both CK-4 and API SN, and I'd assume that these are the oils that Ford is concerned about.