Phosphorus
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FTE-Spread The Knowledge
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If only CJ-4 appears under API service and CK-4 is NOT present, it is ok to use. If CK-4 appears on the API service, that oil needs to be on the latest Ford approval list, that F-350 posted earlier, before that brand can be used safely.
Post Fiend
Joined: Mar 2007
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From: Texas
The claim is that CK is backwards compatible, so the argument can be made that any CK oil is safe for CJ rated engines. Not so according to Ford. Smart advice is to ignore the label and choose an oil on Ford's approved list.
Post Fiend
Joined: Mar 2015
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From: Blairsville, Pennsylvania
Thanks all for the info
When my new (rebuilt) injectors arrive, what would YOU run?
Post Fiend
Joined: Mar 2007
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From: Texas
Ask me next week. I've sent off a sample of the Valvoline heavy duty to blackstone and am currently awaiting results. I may or may not change my opinion once I receive the results.
Post Fiend
Joined: Mar 2015
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From: Blairsville, Pennsylvania
Fleet Mechanic
Joined: Dec 2010
Posts: 1,546
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From: Wellington, Co
So, what changed with the older oils? I have been using either Rotella T or Mobil Delvac 5-40 for years with great Blackstone reports. I have seen a lot of mention of but haven't seen why the CK designation is bad?
Thanks.
Thanks.
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Post Fiend
Joined: Mar 2007
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From: Texas
Walking helps with emissions too, which is what Ford is hinting we might be doing if we start using a non-approved CK oil.
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FTE-Spread The Knowledge
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Can't wait to hear your results!
Fleet Mechanic
Joined: Mar 2017
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From: Phenix City, AL
So, should I be worried that my last oil change with Shell Rotella T6 isn't on the approved list? What should I change to? Should I shorten my change interval and get it out of there?
FTE Leadership Emeritus
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From: Lake Hartwell, GA
Nope, you should not be worried at all about T6.
Fleet Mechanic
Joined: Dec 2010
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From: Wellington, Co
Thanks Chris. Crap this is confusing. Most of the recommended oils are 15-40, not much out there in the 5-40 range. Plus this seems to start with the 6.7s? Talk about tighter clearances, etc. Might just stay status quo, shorten my change interval and ship off to Blackstone sooner rather than later. At least until my injectors die, then "honey, I have to replace them"!!
Post Fiend
Joined: Mar 2007
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From: Texas
Me too. Not a peep from Blackstone yet, but they haven't charged my card yet either, so maybe they're just behind. Or the sample got lost in the mail.