Dave: I've been running Detroits for 45 years in off road motorscrapers, mostly 8V-71s and a few 12V-71s. A friend of mine purchased a new Hancock 292 with a 4-71. He wanted to treat it well because it was the first new machine he had owned. At the first oil change, He used the highest detergent multigrade oil available. After a 1000 hours, his engine died. Tore it down to find that the ports were loaded with carbon and it had been flaking off and scoring the cylinders. Bottom line was that the good oil had a high fly ash content and it was burning and building up on the ports. He went to a oil that was low in ash in the new rebuild and it was still running well when he sold it 7500 hours later. I have always run staight 40W in my Detroits. It turns out that is the cheaper oil. I use 40W because in central Calif. cold is not an issue, 105' is! Detroit has a spec. on the limit of percentage of ash. I have forgotten it now, maybe has to do with that 45+ years running Iron. Good luck! Mel
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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