When I started in the motor business some 40 odd years ago I worked for a British Motor Corporation dealership, and every 24,000 miles sumps were removed and all the sludge scraped off and cleaned out. These were the days when oil was changed every 3,000 miles.
Things are a lot better now and engine oils are a vastly improved product but one thing remains exactly the same. No matter how expensive the oil is :-
OIL IS CHEAPER THAN METAL.
Here endeth the lesson.
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