Normal service 3to 4K in your case 5K. Synthetic does not extend the oil life. Extended oil change recommendations get the manufactures credits toward mileage, Those recommendations are are based toward oil conservation and emissions.
Your call its a high price to pay if your engine suffers from extended oil changes.
The manufacturers will also get mpg credits for adopting efficient technologies that often show no effect on the official test cycles.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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