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 - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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