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Best results are with the NGK V-power spark plugs and yes, every 15,000 miles seems like a good idea.
I use synthetic 0w 30 oil in the transmission and engine.
Something I've wondered about is my mileage and battery age, I know my starting battery is near the end of it's life and my mileage hasn't been nearly what it should be, upper 40's and that the alternator is going to always be working to try to keep the voltage up on a weak battery, thus it will put more of a load on the engine.
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