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Old 11-08-2002, 08:42 PM
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Post dissappearing oil

My buddy owns an 86 mustang 5.0. Every 300 miles hes a quart low on oil. Theres no smoke from the exhaust and its not leaking anything. Any ideas what it could be????
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Old 11-08-2002, 08:47 PM
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Is it going into the coolant???Hope not.That ain't good.
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Old 11-08-2002, 08:56 PM
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Has your friend been under the car? There are many places the oil can LEAK out. The rear main seal is a very popular spot. Also the valve covers at the rear of the motor. From underneath you can get a better prospective of the oil loss posabilities. The oil filter is also a good place to look for a leak/loose filter. Oil pan gasket bolts will seep oil if loose. And the dreaded oil in the water syndrom, hopefully not, water looks lite brown and foamy.

[ November 08, 2002: Message edited by: tm454 ]</p>
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Old 11-08-2002, 08:57 PM
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The coolant is clean. It just got smogged and I'm thinkin if it was burning it ( 1 quart per 300 mi) would probably be visible.
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Old 11-08-2002, 09:00 PM
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the car is parked in the same spot in the driveway everyday and there isn't a drop evident.
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Old 11-08-2002, 09:33 PM
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If the engine was truly burning that much oil, you SHOULD see it in the exhaust. I would pull some plugs and read them just in case though. Hey, stranger things have happened!
Has your friend switched to synthetics recently by any chance?
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Old 11-09-2002, 02:52 AM
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I would lean toward the rear main if it's manual especially if he's running synthetic, had the problem with mine and there was hardly any noticeable trace.
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Old 11-09-2002, 03:24 AM
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ford 5.0 are notorious for bad valve guides. and for some reason they dont always show smoke.

i had mine done twice because of the same thing. was using a quart every 600 miles.

there is a bulliten on burning oil. ford says using 1 quart of oil in 3000 miles is not a problem. its just normal consumption.

also check out the flame arrestor underneith the pcv valve. if they clog they will cause excessive pressure in the motor and it will leak everywhere, even into the guides.
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Old 11-09-2002, 03:53 AM
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check the pcv or crank case vent system, if not correct will cause oil consumption. I have a friend that had a vega way back when that used a quart every 150 miles, and you could follow this car and never see smoke of any kind, but then it was a vega!
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Old 11-09-2002, 09:48 AM
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An old seat of the pants try would be to drive it in low to about 30 mph then let off. I've been able to identify a potential piston/ring issue that way, primarily when evaluating/buying a used vehicle. Not very scientific. Without going back to the posts and loosing this screen, have you done the compression check thing?
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Old 11-09-2002, 10:16 AM
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could be leaking from valve covers onto manifold and burning away. i had the problem with an explorer. couldnt see the smoke unless i opened the hood.
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