Say you had a dead cylinder, like a bad plug wire or bad plug...
The PCM would see all of the extra oxygen in the exhaust stream, and its correction for this is to add more fuel to richen up the mix... If the car run too rich for too long you can wash down the cylinder walls and sooner of later the oil will become very contaminated and begin to thin out... This is exactly what happen to Sandrocks SSEi Bonneville and why he got it so cheap.... Had a bad coil and the kid that had it drive it running very rich... It destroyed the bottom end, so much so that we went and got another motor for it as opposed to fixing what we had..
so running very rich doesn't help a motor..
Your family is pretty sure its bottom end?
If thats the case I am sorry to hear that.. I am on Motor #3 Myself and only at 166k
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