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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

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  Jim Grant's Tech Tips

95 Plymouth Neon, Suspicious Oil Disappearance
Q: I have a 95 Plymouth Neon which is eating 2.5 qts of oil in 900 miles. I am the original owner of the car and have had no crashes or accidents. There is no white smoke or smell of burning oil. No suspicious puddles on the ground. The Chrysler techs did an engine compression test which was ok and they placed dye in the oil twice to find the leak, but no one can find it. The Chrysler techs suggested tearing the engine down and rebuilding it, but didn't hold much hope of finding the problem. I called Chrysler Corp. and they said that a car over 70,000 miles normally uses up to this amount of oil !!! And finally, why would a car that almost replaces the full amount of oil twice in 2700 miles need an oil change? Help please or send me a pair of fabulous walking shoes...Diana

A: I can tell you about brake shoes but not much about walking shoes. Why change the oil in an engine that seems to be doing just that on its own? When an engine is consuming oil in the manner that you describe, it's using the good part of the oil and leaving the junk behind. The oil filter can only deal with so much junk before it will not be a filter any more. The result will be increased engine wear and shortened engine life.

As for the oil consumption, it's most likely a sticking or weak scraper and/or oil control ring on the piston. Why doesn't a bad scraper or oil ring show up during a compression test? Because these parts don't have much involvement in sealing the cylinder. That's the job of the top compression ring. Oil control is performed by the two rings located below the compression ring. If the compression ring is doing its job compression will test great but the engine can still burn oil. Why don't you see blue smoke bellowing out the exhaust? Well there are a couple of reasons. The scraper and oil ring really don't have to work until the engine RPM is up, like at highway speed. At highway speed the wind inside the engine, caused by the spinning parts, is like a hurricane. This hurricane sends oil flying as well. That is when the scraper and oil rings have to really get down to business. If they don't, oil moves past and into the cylinder where it is burned. The compression ring has no oil control ability so it's no help at all. Then there's the catalytic converter. At highway speed the converter is cooking and it has no problem toasting the smoke made by the oil. The end result is little to no blue smoke out the exhaust to be seen. One other note, it is not common for an engine in today's vehicles to use that much oil when the engine has 70k miles on it. Someone just doesn't want to deal with your problem. They're feeding you a bone, hoping/thinking you'll go walking.

 
     
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