I have ran two Briggs 14.5 HP OHV engines for years with Mobil ONE 10W-30. I change it ONCE a year in the spring. NO problems yet. On of these engine,one was a Brand New repower for my Father-in-Laws Snapper mower. This engines Code number is:060117ZD. The only oil this engine has had in it was 30W Pennzoil for five hours of break-in and five changes of Mobile ONE 10W-30. ALL of my generators with small engine have Mobile ONE 10W-30. I have one 5000 Watt generator with a 11 HP Briggs L-head that is LP fueled. I ran it for SIX days/144 Hour without a oil change and only shut it down FOUR times to check the Mobile ONE 10W-30 oil. The likely reason the owner manual does not mention synthetic oil is because you engine was built before synthetic oil was widely available. Oils have changes a lot in the last 10 year. Some for the better, some for the worse IE no ZDDP in many oils that flat tappet cams need especially if running stout valve springs.
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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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