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Old 05-05-2014, 08:04   #1 (permalink)
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Slow oil burn

What would cause a 6 cylinder 94 ranger to burn a half quart of oil every 3k miles?


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Old 05-05-2014, 09:53   #2 (permalink)
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Re: Slow oil burn

If no leaks , valve stem seals or rings ? but you usually see indications like puff of blue smoke .
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Old 05-05-2014, 11:23   #3 (permalink)
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Re: Slow oil burn

Stuck oil control rings on the pistons. Go to a local auto parts store and purchase new oil and oil filter, and engine flush chemical. Be sure that the directions are clear, if not choose a different type of flush. Follow the instructions exactly, and change the oil and filter after the flush is added.
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Old 05-05-2014, 11:49   #4 (permalink)
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Re: Slow oil burn

Thanks for the helpful info. The truck in question is one that I am considering buying. Just wondering if it is or will turn into a huge problem. Also wondering if I can use it as a bargaining point, then fix later on.

What are some signs to look for while test driving so I can pin point the problem? For example, blue smoke, etc.


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Old 05-05-2014, 12:17   #5 (permalink)
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Re: Slow oil burn

Depending on mileage , but with a 20 yr old truck , dont think a pint of oil every 3,000 mls is really bad .If you let it idle for a while when hot , then blip accl . , look for blue smoke at rear .
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Old 05-10-2014, 11:25   #6 (permalink)
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Re: Slow oil burn

To check for valve stem seal leaks, you can also coast down a hill, or coast to a stop, and then observe the exhaust for a puff of blue smoke when you accelerate from a stop. The coasting will cause higher vacuum in the intake, and increased suction pulling the oil past the seals.
Consumption at that rate is totally within acceptable FoMoCo norms. Their unpublished limit is 1 quart in 600 miles. You beat that significantly.
Look at the oil pan gasket, front and rear seals, and rocker arm cover gaskets for seepage. The pan is noted for being difficult to seal, but new and 'improved' gasketry is available.
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Old 05-10-2014, 11:46   #7 (permalink)
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Re: Slow oil burn

^x2 A lot of the fairly recent GM European cars are bad for oil consumption .Vauxhall / GM state that most of their engines will use 600ml of oil per 1000 kmiles .Bad for a fairly new car.
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