I change it when the oil is burn-your-hand hot. All of the contaminates are still being suspended in the oil instead of lying on the bottom of the pan. Thanks to the depth of the female threads in the oil pan, your son does realize that about a half inch of oil never drains out of the pan, doesn't he? Anyway, I guess it doesn't really matter too much, as long as the oil gets drained. Years ago, I bought a '78 Mercury Zephyr (Ford Fairmont clone) with the factory 302. I knew the engine had been neglected, but I bought the car because it had a 302 in it. Anyway, I had to change the intake manifold on it and when I pulled it off, there was so much crude in the lifter valley that I couldn't see the push rods, lifters or anything else except the crud. I suspect the oil had gone 25K miles on cheap, store-branded bulk oil. There was no resurrecting that engine.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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