Where is engine oil going?
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Where is engine oil going?
I have a 1989 F250 7.5L V8 with 89,000 miles used for work only. For the past couple of years I have been putting roughly 3 qts. of oil every 1,000 miles.
Just got it back from the dealer and they couldn't find any evidence of a leak. Everything was dry underneath. The service guy said it was because of the age and not the mileage that it was using the oil. That doesn't make sense to me.There is no sign at all of any smoke at the exhaust of under the hood at anytime (warm-up or driving).
Where's the oil going or why?
Just got it back from the dealer and they couldn't find any evidence of a leak. Everything was dry underneath. The service guy said it was because of the age and not the mileage that it was using the oil. That doesn't make sense to me.There is no sign at all of any smoke at the exhaust of under the hood at anytime (warm-up or driving).
Where's the oil going or why?
Lead Driver
Joined: May 2011
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3 qts every 1000 may not be smoking, especially if you have the factory cats catching oil.
Time for blowby, compression, and leak down tests. Performing leak down ring test on each cylinder is tedious, you have to find tdc on comp stroke on each one.
Time for blowby, compression, and leak down tests. Performing leak down ring test on each cylinder is tedious, you have to find tdc on comp stroke on each one.
Logistics Pro
Joined: Mar 2005
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From: Mexico, Missouri
Didn't see anyone mention the PCV valve.
If it's not Motorcraft, then I call it junk. It may be as simple as a malfunctioning PCV valve. Either a cheap one allowing oil to be sucked in or an old one sticking and allowing for oil to be sucked into the intake.
If it's not Motorcraft, then I call it junk. It may be as simple as a malfunctioning PCV valve. Either a cheap one allowing oil to be sucked in or an old one sticking and allowing for oil to be sucked into the intake.
Senior User
Joined: Jan 2016
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From: Oregon
I second checking the pcv valve - motorcraft only. I am not familiar with the 460, but on my 302 there is an air tube that runs from the oil filler neck to the airbox, and inside the airbox there is a small filter. I would check that too to see how dirty it it.
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Oil smoke comes out of a cat nice and blue, fwiw.....(our luxobarge started smoking on startup, and it's not even 18 yet!)
Rev it up to 2000 rpm for a few minutes and see if you get a puddle. For best results, do this on a new concrete or paver driveway.
Rev it up to 2000 rpm for a few minutes and see if you get a puddle. For best results, do this on a new concrete or paver driveway.
Lead Driver
Joined: May 2011
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This sounds like clogged pcv. The engine will eat oil vapor from a clogged pcv no problem, without any real symptoms, but when it goes unaddressed long enough...oil collects in the intake, and puddles collect even more vapors, creating a chain reaction which turns into an oily mess. The engine can't digest oil in liquid form the same it does vapors, so now it blows blue.
Fleet Owner
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From: Kentucky
Postmaster
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From: Cleveland, TN
When you replaced the PVC valve, did you check the vacuum on the line going to it to be sure there was vacuum getting to the valve?
Posting Guru
Joined: Oct 2009
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From: Ohio
I saw that too...intake manifold was wrong. The mating surfaces were cut at the wrong angles, and the gasket could not make a seal at the bottom in the valley...it was off by almost .125 at the bottom. A proper intake manifold and new gasket was the fix.
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