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Does Previously Purchased Mobil Delvac Comply with CJ-4?
I have two unopened gallons of Mobil Delvac 15W-40 CI-4 PLUS imprinted "OEVO3BS 8-4-8 09461". Does this oil retroactively meet the CJ-4 API Service qualifications? Can I use this in my 2011 6.7L Ford ...
There were formulation changes done to Mobil Delvac 1300 Super 15W-40 in order for the product to meet the performance requirements stated API CJ-4.  API CJ-4 is backwards compatible with the previous...
ZDDP Levels of Mobil Delvac
What are the current ZDDP levels for Mobil Delvac 15W-40? Is it recommended for classic engines with flat tappet camshafts?
Mobil Delvac 1300 Super 15W-40, which meets API CJ-4 performance standards, has a Phosphorus limit of 0.12 wt%.  With respect to your question on slider tappets, Mobil Delvac 1300 Super 15W-40 meets C...
Using a CJ-4 Motor Oil in a Gas Engine Having a Catalytic Converter
Is it OK to use a CJ-4 oil in a gasoline engine with a catalytic converter?
From an engine performance viewpoint, the API CJ-4 oil should provide adequate protection. But this heavy-duty viscosity grade has a higher level of phosphorus than typical ILSAC GF-5/API SN oils desi...
Was a Dodge Ram Harmed Since CJ-4 Oil Not Used
I have a 2001 Ram diesel truck with 57,000 miles on it. I've used Mobil 1 15W-50 since it had 500 miles on it. I will be switching to the new 5W-40 turbo diesel truck. Did I do harm to my engine becau...
No.  CJ-4 is a certification valid for 2007 and newer engines due to new EPA requirements.  You should be fine.
Explain the Differences Between the Diesel Motor Oils
I noticed on your web site that the Mobil 1 Turbo Diesel Truck 5W-40 is rated CJ-4. I currently use Mobil Delvac 1 ESP 5W-40, which is also rated CJ-4 in my 2008 Chevrolet 2500HD Duramax Diesel. Are t...
Both products have different formulations and both exceed API CJ-4 requirements. Either product, however, can be used in your particular engine. Mobil 1 Turbo Diesel Truck 5W-40 is specifically formul...
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