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I kind of agree. Granted they are not all the same, but I put more stock in the filter and changing it when needed and running the approved CJ-4 oil.
 

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Mine starts complaining at 5k also. Mileage drop is the biggest sign it's time for a OC. I just tried the new 15-40 CJ4 rotella this time around and so far I'm very happy. Good price to boot. That's the main reason I don't run Synthetic oil, it's not CJ4 and it's expensive.
 
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