Originally Posted By: turtlevette
What did it show? Isn't the remedy for gas and water in oil to simple take a cruise for a couple hours?
It showed TAN exceeding TBN, which means excess acid buildup that leads to excess wear, based on many industry studies that I've seen. A long cruise might help burn off moisture, but from what I understand, fuel dillution causes irreversible changes in the oil, even after it's been burned off. Besides, taking a cruise for a couple of hours just wasn't practical. For the time and money I'd spend, I'd rather just change the oil.
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In general how many uoas come back saying the oil is used up to the point that it no longer lubricates?
Lubrication is not an on/off type condition. An oil will continue to lubricate for a long time, but in progressively worse manner. And where you draw the line is very subjective, I'm afraid.
Would my engine explode if I kept that oil in there for another year? I doubt it. But I can see how continued operation like that could eventually lead to problems down the road. Would I still be owning the car when that happened? Who knows?
However, most manufacturers do place a 1 year limit on OCI, regardless of miles, and for those falling under severe service, I think this is reasonable. Then again, most manufacturers in Europe have extended it to 2 years, and as far as I know, their cars are still alive.