Re: oil pan sludge removal
Most of the oil pan sludge was due to the use of non detergent oil. Today's oils have additives to keep the contaminants in suspension. Years ago, we had to scoop out the gobs of "black jello" when the pan was dropped. Some oil pans, such as the Ford tractors, had a large removable port in the bottom of the pan to allow access to deposits. It came in handy, as the engine formed the frame of the tractor, and the oil pan couldn't be dropped without splitting the machine. Thankfully, non detergent oil is now history!
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