I"ve never seen any hard data on this but if I was concerned about this question ,I"d pull the valve cover off and see if there was sludge on the valve train components. if there was then I"d think i ought to change the oil more often. If you don"t see any sludge then all is probably well with your oil change schedule. If you want to be certain, have your oil analyzed
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Today's Featured Article - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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