It's pretty easy to tell how an engine's been treated, if you pull the valve cover(s)and there's a lot of sludge/ varnish in there, there's probably a bunch in the pan, too, and detergent oil could wash it loose to run through your bearings, etc. Anytime I have anything that's questionable, I'll change the oil & filter as soon as it picks up any color (gas of course)at least a few times if I go with detergent. If it's clean under the valve cover, should be pretty clean elsewhere, good sign that it's been maintained well. If you have a good filter doing it's job you might not see much color for a while, as the filter"s catching the crud as it should- but if the filter gets full, it'll bypass the crud back into the engine- not good
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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