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Send an oil sample to Blackstone (or your favorite lab) and have it tested. That's the best way to know for sure if you can use the longer oil change interval.

I see you have an '06. My intervals for oil change is 7,500 & 15,000 miles. Those 3,750 intervals are on the "B" schedule for checking and greasing items mostly.

I have no problem going 15,000 miles between oil changes. My last analysis indicated I could probably go another 10,000 but I'll stick to the recommended until the 100k is up.
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