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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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