Posted by Pete in Holland MI on April 28, 2020 at 20:48:41 from (68.188.148.217):
In Reply to: Changing Oil posted by Binderson on April 28, 2020 at 20:35:07:
This gets asked nearly weekly. The manual was based on oil technology in the 30's, so disregard that.
If the oil pan is relatively clean inside, 15w-40 Rotella is a favorite. Some people will stick with a straight 30 weight. 10w-30 for others. All of these are detergent oils, which some will argue will loosen up all old sludge, block the oil galleries, then wreck the engine. Have not heard of that happen in all of my years.
If it hasn't been run in years, would suggest draining the oil, then pull one of the inspection covers on the side. Reach down and check for sludge in the bottom of the pan. More than 1/2", drop the pan and clean it out. Less than that, fill it with new detergent oil. Run it till it gets good and hot at a higher speed, then drain the oil and refill with detergent oil. This way, you have a base line as to the cleanliness of the oil system.
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