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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