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Incomplete engine oil drain

Dodgeman

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Why don’t manufacturers put the engine oil drain at the low spot of the oil pan? On our 2022 Cummins 6.7, the oil pan has a low spot to the rear of the drain plug. Being a bit anal, I’ve fashion a “j” shaped hook of metal connected to a drill pump. I get close to a half quart of dirty oil out of the low spot. On our Toyota Tundra and Acura RDX, the drain plug is on the side of the oil pan, not the bottom, a bit of distance above the bottom. In both of those cases, I jack up the side of the vehicle to drain out more oil.

I guess the oil filter removes solid contaminants and the half quart of old oil doesn’t dilute the new 12 quarts all that much, but I hate the thought of oil dirty oil mixing with the new stuff. It seems so me it wouldn’t be that difficult to shape an oil pan correctly.
 
If that bothers you then I suggest you don’t pull the valve cover and see how much oil sits up there after shutdown.
 
I guess this demonstrates the old saying, “the solution to pollution is dilution”. Draining out MOST of the dirty oil and adding clean oil must renew the total mix enough to do the trick.
 
Treat it like sourdough. Gotta train that new ingredient.

FYI, the engine oil capacity is 12 qts so if you (not you Dodgeman) leave 1/2-3/4-1 qt in there and add 12, it's technically overfill. The tolerance for over/under isn't going to be bothered by that.
 
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