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Original post by: Cliff ,


Doesn't it beg the question, why is there a need for any type of additive to compensate for a lousy rocker arm design, that seems more apparent in the 2005 and newer ISX engines?  What, if any, does the CJ-4 oils not provide the protection for a design that was developed prior to CJ-4 standard?  Cummins is sure being tight lipped about all of this, even though they have acknowledged there is a problem.