Sitting for years on the shelf allows some of additives to settle and should be mixed/stirred before use. As to old oil, my father bought 6 each 55 gallon barrels of oil about 1960 and had used 4+ barrels before he died in 1964. Not having a business fleet, I am still using from that last barrel today in my 8N tractor. It is about empty now but I have not seen any negative results from this rather old oil for this lengthy period of use. Try to change yearly, but occasionally fall down on the job. I also use for bar oil in saws and maybe a few other lube jobs. Just for fun, in ~2013 I ran across opportunity to get lab analysis of a can of this oil bought at same time as barrels (handy in tool box when on the road) and in every case it had lower additive amounts than current day oils, even the much talked about Zinc (517 vs 800 PPM).
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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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