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hey was wondering if the older etech and aset engines can run off that newer cj-4 15w40 oil been having a sales rep pester me about making a switch. I did some research about the oil and got some good reviews and I know the newer Mack engines require the use of it.

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Just read an article in Land line magazine about oils. C J- 4 is being replaced by CK- 4. Which is backward compatible in older engines. Newer engines will require FA-4. I would guess yes. 

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