I ran my car very low on oil years ago, due to a leak in the cam cover. It was driving more or less fine until fairly suddenly I noticed a big drop in power while going uphill, and the car water temp went up, I pulled over within 1 mile and checked it out, found nothing on dipstick, got some oil and discovered I was 4qts low. I refilled the oil and the car ran fine for years. I never noticed anything until that one long pull uphill. Had I kept going another mile or two, I might have completely ruined the engine.
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