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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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