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 - Antique Tractor Solvents - by Curtis Von Fange. Solvents play an important role in keeping our tractor clean and running efficiently. There are many different types that can be used for external and internal cleaning of the various tractor parts. Being aware of the different types of solvents will make any cleaning job go easier because one can select the correct cleaning agent for the task at hand. Let’s take a quick look at what is available and readily used in the solvent larder of our shop environment. The most universal solvent in
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