Dr Evil, Respectfully, I'm going to call you out on this "sludge is harmless and doesn't get in any oil passages." comment you made. Your just plain wrong on both of those. Engine sludge is generally caused by excess moisture in the crank case. Think about it. You say it's not in the crank case, only on the dipstick and the oil fill port. Well guess where the dipstick is? It's the crank case. The sludge foam from the moisture floats to the top because of the air in the foam, but guess where the rest of the moisture goes? To the bottom of the oil pan where the pickup tube is for the oil pump! That contamination is being circulated through out the engine to all oil passages large and small. To clear out this contamination, the engine needs to be brought up to running temperature, change the oil, then run it more and drive out the remaining moisture. I don't know if this tractor uses a thermostat, but if it does, it probably needs a new one. It's very hard on an engine to not ever get up to proper temperature. You never drive out the condensation if it always runs cold. Sludge builds, and eventually, the engine oil passages clog up and premature bearing failure occurs. I've opened up many sludged up engines that were just neglected or the owner didn't realize they had a problem with engine temperature. A bad thermostat sometimes makes an engine run hot, but if it's stuck open in cold weather, it won't let it get warm. If the engine is so old it never had a thermostat, there were manual ways of controlling the engine temperature, like covering the radiator.
I pasted your post below for argument purposes. :D
"That brown goop never gets close to any small oil passages. You only see it in places where no oil circulates and that are away from engine heat. Places like the top of dipsticks like in this case and oil fill ports. There's none of that goop in the crankcase. No need to change the oil, an oil analysis would show no fuel or coolant in the oil. Any place that warm, not hot oil circulates will be clean. Yes, running the engine for longer time periods helps, as does covering the entire radiator to raise engine temp. Idling the cold engine actually makes the accumulation worse, lowers engine temp more. But running ANY engine when it's really cold is hard on it. It's funny.... You think something harmless like this is abuse and is bad....yet you store ALL your equipment outside in the weather which is the worst thing you can do to equipment!"
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