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Holy thread revival. I would pass on the schaeffer 9k. It isn't on Ford's approved oil list meeting the minimum for Zinc/Phosphorus these days now that its CK4 vs the old CJ4 spec they were talking about in 2011.
I would stick with the Amsoil or give the LE 8854 a shot if you're into the "gourmet" oils.
The oil wars! lol I have been doing oil tests for over 12 years and nothing beats Schaeffers! The 'other' oil's shear down, Schaeffers doesn't. That simple!
Going slightly deeper into this without beating a clearly dead horse...
CJ-4 and CK-4 oils can and some do have an API certification of CJ-4/SN or CK-4/SN. Those are the oils you DO NOT want to use in your diesel truck. Organizations like the API that certify oils with a SN rating have guaranteed a maximum of 800 ppm of ZDDP/ZDTP in that oil. You can find some oil elemental analysis information at the PQIA website, but not everything is there.
Below is a recent picture that I created from two other FTE'rs posting the back of the bottle of the oil they purchased. See the SN on the right and not on the left? SN is NOT what you want for your 20 year old 7.3L.
You may be able to find some left over stock with an API rating of CJ-4/SM, which is good and OK oil to use. Clearly this is a API certification before SN and before the ZDDP/ZDTP limitations were as strict as they are now.
So, if you see someone bragging about scoring some CJ-4 or CK-4 oil for cheap or saying they found "the good stuff", let them know that the details count. This is not to say that if someone runs an SN oil in their truck it will explode and die a fiery ball. Not at all... The API SN certification only means that the oil is not as good for the 7.3L as it could be and the owner may want to select another brew or formula for long term use.
I only recently learned this and it caused me to reexamine the oil I had selected for each of my vehicles. Going forward, I will be more informed and educated on what I am looking at and for.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
