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 - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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