Originally Posted by Luke
Yeah, as you can see they recommended 6000 miles, this oil had just over 4000 on it. I have read though that if the TBN is below 3 it's about time for a change. Since there is already RP in it now I'm going to 7500 and will compare.
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I think you will see gd results with Royal Purple. Thanks for taking the time to send off for oil analysis. Are you running a OEM filter?