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Tom nailed it... use a diesel rated oil.. diesels produce high soot loading in the oil.. they also produce sufuric acid from the sulfer in the diesel fuel mixing with moisture.. Diesel rated oils are specially designed for heavy duty applications like this.. plus the meet all the gas engine requirements as well. They are fortified with special additives that will fight the acids and nuetrualize them, and keep the soot in suspention and are designed for 10,000 miles of heavy duty use.. this is about 167 hours of extreame heavy duty used... meaning if your plowing under full load.. change your oil every 150 hours is more than adequate.. if your bushoging, and misc farm chores... you can run about 200 hours between changes.. these new oils are rated by api (american petroleum institute) CI-4.. again they also will meet and far exceed all the gas engine requirements.. wally world, sams, and most all truck stops carry these heavy duty oils in gallon containers for about $6.50 per gallon.. give or take.. so make sure your oil has the CI-4 rating on it to get these heavy duty specifications.. rotella, delvac 1300 , chevron delo 400, 15w-40 0ils are perfect.. if you work your tractor in artic conditions were is constantly below zero.. consider using the fully synthetic versions that are 5w-40 but are much more expensive.. but they only help when its below zero... and they are considerbly more expensive and have to be changed as often as the 15w-40s.. actually the full sythetics have more trouble keeping additives in suspension and should never be run beyond recommend change intervals.. or you will take a chance of soot abrasion and wear on the main and rod bearings... good luck.. bill
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