302 Oil Consumption
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Junior User
Joined: Apr 2002
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302 Oil Consumption
Yeah it's bad.
My 79 F-100 is my work truck and it goes through a lot of oil. I know the rear main seal is worn, but with only local driving (landscaping) is uses about 1 quart of oil in a week. (75-100 miles)
When I run the truck on the highway on weekends, the oils consumption skyrockets. It burns a quart per 60 miles of driving. (65mph, C6 no O/D 2800-3200 rpm)
I have been told that these engines blew alot of oil through the vent system, but this is getting bad.
What is strange is that this engine runs like it's brand new. Just burns oil.
Any ideas?
Adam
My 79 F-100 is my work truck and it goes through a lot of oil. I know the rear main seal is worn, but with only local driving (landscaping) is uses about 1 quart of oil in a week. (75-100 miles)
When I run the truck on the highway on weekends, the oils consumption skyrockets. It burns a quart per 60 miles of driving. (65mph, C6 no O/D 2800-3200 rpm)
I have been told that these engines blew alot of oil through the vent system, but this is getting bad.
What is strange is that this engine runs like it's brand new. Just burns oil.
Any ideas?
Adam
Posting Guru
Joined: Apr 2002
Posts: 1,471
Likes: 3
From: Greenwood In. USA
302 Oil Consumption
I had a 79 302 3 spd and it used a qt in about 5000mi, I currently have 92 F-150 302FI that uses 1qt in about 4000mi and it has 130k + on the odo. I think that is about "normal" .Is your leaking out or are you getting blue smoke?
FYI-I put 3 set of valve cover gaskets in 88000mi on my 79 never could get them to stop leaking.
Regards
Gasman
FYI-I put 3 set of valve cover gaskets in 88000mi on my 79 never could get them to stop leaking.
Regards
Gasman
Lead Driver
Joined: Feb 2000
Posts: 5,374
Likes: 46
From: Palm Bay, Florida
302 Oil Consumption
You might try some rear main bearing sealer if yours IS leaking, also might try some "RESTORE" in your crankcase, this stuff got me 5k miles out of an extreemly worn out, neglected 302 a few years back, its worth a try.
Mountain Pass
Joined: Sep 2019
Posts: 100
Likes: 1
1979 F100 is using a quart per 100 miles on average. It's a 302 and has 18k original miles. It sat in a yard and was not driven regularly - obviously. No leaks, may burn a bit (smoke from exhaust) but not a "Cloud of Smoke" situation
What should I look at to reduce the amount of oil it's using?
Thanks,
What should I look at to reduce the amount of oil it's using?
Thanks,
Lead Driver
Joined: Apr 2008
Posts: 6,938
Likes: 13
Its leaking or blowing it out, or both? They dont really lose much through the "vent system" (pcv) if everything is in good shape. Most likely the 41 year old valve seals (and probably guides) are shot. Burning that much however would foul plugs pretty regularly which makes me think that youre leaking quite a bit too. First step always in an oil consumption problem is check the pcv system and replace bits as necessary. Too many times i have seen guys even remove the pcv because "eMisHuNS StUf BAd". Its actually better than just venting like the olden days because it makes a slight vacuum in the crank case which GREATLY helps compromised seals, and even helps with a little windage control..
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Mountain Pass
Joined: Sep 2019
Posts: 100
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Putting very few miles on the truck - seems to lose more on highway, but yes it loses what seems like a quart per 100 miles (one hundred)!
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Mountain Pass
Joined: Sep 2019
Posts: 100
Likes: 1
Its leaking or blowing it out, or both? They dont really lose much through the "vent system" (pcv) if everything is in good shape. Most likely the 41 year old valve seals (and probably guides) are shot. Burning that much however would foul plugs pretty regularly which makes me think that youre leaking quite a bit too. First step always in an oil consumption problem is check the pcv system and replace bits as necessary. Too many times i have seen guys even remove the pcv because "eMisHuNS StUf BAd". Its actually better than just venting like the olden days because it makes a slight vacuum in the crank case which GREATLY helps compromised seals, and even helps with a little windage control..
Lead Driver
Joined: Apr 2008
Posts: 6,938
Likes: 13
If memory serves, going to be in the rear of the passenger side valve cover. Little metal and plastic elbow lookin thingy with a hose attached. Make sure hose is hooked up to the big vacuum tree or base of the carb. Pull the pcv off, give it a shake, the valve check ball should rattle around. Start it and make sure there is good vacuum making its way through the hose and the pcv valve.
Mountain Pass
Joined: Sep 2019
Posts: 100
Likes: 1
If memory serves, going to be in the rear of the passenger side valve cover. Little metal and plastic elbow lookin thingy with a hose attached. Make sure hose is hooked up to the big vacuum tree or base of the carb. Pull the pcv off, give it a shake, the valve check ball should rattle around. Start it and make sure there is good vacuum making its way through the hose and the pcv valve.
I’m new to this motor/truck, so flame suit is on ...
Lead Driver
Joined: Sep 2003
Posts: 7,015
Likes: 208
From: SoCal
That looks like the breather for the PCV system. When the valve opens up and applies vacuum to the crank case, that breather allows clean air to enter from the opposite side.
On my 87 5.0, there is a hole (with a grommet) in the back of the intake manifold that the PCV valve is stuck into. Then there is a hose on the oil filler neck that gets clean air from the throttle body.
In both cases, the hose coming from the valve goes to a manifold vacuum source.
What's on the other valve cover?
On my 87 5.0, there is a hole (with a grommet) in the back of the intake manifold that the PCV valve is stuck into. Then there is a hose on the oil filler neck that gets clean air from the throttle body.
In both cases, the hose coming from the valve goes to a manifold vacuum source.
What's on the other valve cover?
Mountain Pass
Joined: Sep 2019
Posts: 100
Likes: 1
That looks like the breather for the PCV system. When the valve opens up and applies vacuum to the crank case, that breather allows clean air to enter from the opposite side.
On my 87 5.0, there is a hole (with a grommet) in the back of the intake manifold that the PCV valve is stuck into. Then there is a hose on the oil filler neck that gets clean air from the throttle body.
In both cases, the hose coming from the valve goes to a manifold vacuum source.
What's on the other valve cover?
On my 87 5.0, there is a hole (with a grommet) in the back of the intake manifold that the PCV valve is stuck into. Then there is a hose on the oil filler neck that gets clean air from the throttle body.
In both cases, the hose coming from the valve goes to a manifold vacuum source.
What's on the other valve cover?
Lead Driver
Joined: Sep 2003
Posts: 7,015
Likes: 208
From: SoCal