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Steve: Personally I wouldn't look at anything unless it were detergent oil. If you do change to detergent oil, don't run the first fill up more than about 30 to 50 hours. The last tractor I changed to detergent oil had about 3/4" of silt in bottom of pan after about 35 hours. I had to poke my finger through that so oil would drain. Then remove pan and clean. I did that 3 times before silt stopped forming. It did have a filter, but also was a very dirty engine. It cleaned right up and is still going, although it will require a rebuild before long. I never use anything but diesel service 15W-40 motor oils, winter and summer in everything from 6 cylinder turbo diesels, 4 cylinder gas Farmalls, V8 and V6 cars and trucks and 4 cycle lawn mower. By the way lawn mower is 28 years old, same engine. I put a 1/2 million miles on a 6.2 Chevy diesel, no rebuilds. I started this because 35 years ago I was using 3 kinds of oil in 9 trctors, 4 trucks, car, combine and the lawn mower. Employees couldn't seem to keep straight what oil went where. I solved problem by using 1 type of oil only. It started out as single viscosity 30 in summer and 20 in winter. About 20 years ago I switched to the 15W-40, and have never looked back. I live in Canada with winter as it is.
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