Burning oil suddenly?
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Tuned
Joined: Mar 2007
Posts: 254
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From: Sacramento Ca
Burning oil suddenly?
Hello all;
I am having a problem with my truck, it is now wanting to burn oil when I pull. I have a 97 with a 460 and a stick. I pull a 10,000 lb fifth wheel with it regularly. The truck has around 90,000 miles on it and has been well cared for. The last trip I took I burnt about a 1/4 inch on the dip stick in 300 miles.
Any ideas as to the cause?
Additional Info;
1. Generally I tow in 5th with the stick. A mechanic friend recomended 4th as it would be better for the motor and trans.
2. I recently had a O2 sensor go bad on a trip. I was just happy to get home with 5.5 mpg. Could I have damaged something?
3. I think it is entering Via the intake due to heavy oil residue in the "rubber tube" that goes to the throttle body. This is after the enterence of the crank case vent.
I am currently running Mobil 1 10(or 15) w50 oil.
Thoughts????
I am having a problem with my truck, it is now wanting to burn oil when I pull. I have a 97 with a 460 and a stick. I pull a 10,000 lb fifth wheel with it regularly. The truck has around 90,000 miles on it and has been well cared for. The last trip I took I burnt about a 1/4 inch on the dip stick in 300 miles.
Any ideas as to the cause?
Additional Info;
1. Generally I tow in 5th with the stick. A mechanic friend recomended 4th as it would be better for the motor and trans.
2. I recently had a O2 sensor go bad on a trip. I was just happy to get home with 5.5 mpg. Could I have damaged something?
3. I think it is entering Via the intake due to heavy oil residue in the "rubber tube" that goes to the throttle body. This is after the enterence of the crank case vent.
I am currently running Mobil 1 10(or 15) w50 oil.
Thoughts????
Senior User
Joined: Mar 2007
Posts: 201
Likes: 0
Assuming well cared for also means that it wasn't overheated, my bet would be on the valve stem seals. Heat and age will take them out, and any added sludge trapped in a oil return hole let alone part of the seal itself, only compounds the problem.
First things first tho -a compression, or better yet, a cylinder leakage check. This will get to the root of your blow bye issue.
First things first tho -a compression, or better yet, a cylinder leakage check. This will get to the root of your blow bye issue.
Senior User
Joined: Mar 2007
Posts: 201
Likes: 0
One might think that towing would build extra heat and with slightly worn parts burn more oil, but I still think it's a valve guide issue. Why? Towing with a stick, especially when decelerating, will raise and hold manifold vacuum high causing the engine to drink more oil.
Go out, hit 65MPH, dump it in third with your foot OFF the throttle and look for the smokescreen in the mirror that is sure to be following you. The higher the revs, the more oil you'll be pullin' in.
Go out, hit 65MPH, dump it in third with your foot OFF the throttle and look for the smokescreen in the mirror that is sure to be following you. The higher the revs, the more oil you'll be pullin' in.
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Junior User
Joined: Feb 2007
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My 460 has almost 190000 on it. I am never under 12000 GVW with it. If I keep the RPMS down I use no oil. If I rev it up I can use a Qt. in under 100 miles.
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Cargo Master
Joined: Apr 2001
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From: Eustis FL
Originally Posted by 69-highboy
One might think that towing would build extra heat and with slightly worn parts burn more oil, but I still think it's a valve guide issue. Why? Towing with a stick, especially when decelerating, will raise and hold manifold vacuum high causing the engine to drink more oil.
Go out, hit 65MPH, dump it in third with your foot OFF the throttle and look for the smokescreen in the mirror that is sure to be following you. The higher the revs, the more oil you'll be pullin' in.
Go out, hit 65MPH, dump it in third with your foot OFF the throttle and look for the smokescreen in the mirror that is sure to be following you. The higher the revs, the more oil you'll be pullin' in.
(not that I ever abided by the warning! lol)
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