Jack: When these tractors were built multi-grade had not yet been developed. Nothing wrong with multi-grade for these old tractors.
In the mid 70s I was running 7 tractors, (4 diesels, 3 gassers) size from a SA up to a 1066, two gas skidsteers. four GM gas trucks, MF diesel combine, one Olds 88 gas and 4 cycle lawn mower. I was keeping 3 kinds of oil; one for diesels, one for gas tractors and a 3rd for cars and trucks. Several employees were constantly getting these mixed up, not using oil I had selected for a specific purpose. I got fed up and swithed everything to 15W-40 diesel grade motor oil. Since that time I've never rebuild a diesel much under 10,000 hours, gassers roughly 4,000 hours, those GM V8 all went 300,000 miles, even got 500,000 miles out of a 6.2 diesel and the 4 cycle lawn mower lasted 35 years, doing about 1/4 acre on average. Actually the engine on the lawn mower was the only thing original when I sent it off to the scrapyard. Had to put a head gasket in the SA about 10 years ago, and we discovered, pistons and sleeves were original. I had only owned it since 72.
Try as you may, you will not convince me to use anything but the very best diesel multi-grade motor oil. I've never tried synthetic, when it first came on the market, I was already exceeding it's claim on engine life.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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