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Using a CJ-4 Motor Oil in a Gas Engine Having a Catalytic Converter
 
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Question:
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?
-- AS Mills, Seattle, WA
Answer:
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 designed for today’s light-duty trucks and cars. This higher phosphorus level can potentially shorten the life of expensive emission control equipment including the catalytic converter. We recommend you stick with the oil recommended in your owner’s manual.
 
Answer updated April 2012
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