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Does Previously Purchased Mobil Delvac Comply with CJ-4?
 
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Question:
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 Powerstroke? I have been using Mobil Delvac 1 since 1987 in a variety of diesels. I have recommended all Mobil synthetic lubes for years.
-- PF Wiehagen, Barnhart, Mo.
Answer:
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 performance category (API CI-4 PLUS), meaning that API CJ-4 quality oils can be used where API CI-4 PLUS oils are recommended.  It is important to note that due to the performance improvements in CJ-4, it is not recommended to use API CI-4 PLUS oils where API CJ-4 oils are recommended.  If your 6.7L Ford Powerstroke recommends an oil meeting API CJ-4, we suggest you follow that guidance.  Mobil Delvac 1 ESP 5W-40 fully meets the API CJ-4 Service Category.
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