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On older higher mileage engines, it pays to avoid oils with a high detergent content,(Always check label) These keep new engines clean, but as I found out years ago when I started using it in a Jaguar motor, it was the sludge that was sealing the rings, a couple of days on the high detergent oil, (Went through faster than sh.... through a duck,)cleaned the rings so good it was impossible to see out the back window through the smoke.
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