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Originally Posted By: dnewton3 CI-4+ was surpassed for several years now. Still a viable fluid for older diesels, but the 6.4L PSD requires CJ-4. CJ-4's are very good fluids. Either of those (Delvac 1 or T6) are good fluids, but if you're going to OCI with "normal" OEM recommendations in mind...

its for a 6.4 diesel.

I was wondering if anyone has any reports that they can post on Mobil Delvac 5w-40 syn oil and T6 5w-40 syn oil. Just wondering which shows better results

Originally Posted By: 2010F350 Are there any additives that are in a oil that can be more harmfull to a DPF?? Just Ford Motorcraft. Thinking of going to Premium Blue.

Are there any additives that are in a oil that can be more harmfull to a DPF??

I change my oil every 5000kms no matter what. I do tow a 6000lbs trailer in the summer. This truck will get the best maintenance I can give her. I will change to a Syn oil for sure once I get some kms on this old girl, I just thought you were supposed to wait for the engine to break in. If it is...

Hello all a new member here..I have been searching around trying to figure out what the best CJ-4 oil is....I am sure everyone has there favorite but are there bad brands??? I have a 2010 F350 with a 6.4 with 8000kms and want to go with a syn oil but have read it is a good idea to wait for the...