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#1 |
Alright Alright Alright
Join Date: Mar 2004
Location: Midland, Texas
Posts: 1,672
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oil consumption
i have a good running powerful 350 in my 72 cheyenne. yesterday when i was checking the fluid levels in it i noticed that i was a quart low. i changed my oil before christmas. the plugs are clean and there is no smoke in the exhaust. what could it be?
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1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies |
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#2 |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Re: oil consumption
Just because you don't see the smoke doesn't mean that you are not using it.
Could be blow by, valve stem seals or a leak somewhere. |
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#3 |
Senior Member
Join Date: Nov 2006
Location: Yukon Oklahoma
Posts: 2,647
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Re: oil consumption
Oil consumption is a normal by-product of any internal combustion engine. By manufacture standards 1 quart in 1000 miles is considered normal, however we all know better than that. How many miles have you driven since Christmas?? Oil type and weight also play a role. In my experience I have never been a complete quart low at oil change time, 3000 miles, but the level had drpooed some.
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Happiness is towing your "new" truck home. 1972 C-10 1982 GMC (parts truck??) ![]() 1969 c10 parts truck 1969 C-10 ( my sons) 1992 Silverado 4X4 (now the boys truck)(now mine again ![]() 2002 Tarus (my wife loves that car) Last edited by bobthecop; 02-08-2007 at 02:55 PM. |
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#4 |
Hittin E-Z Street on Mud Tires
![]() Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: oil consumption
My Z71 burned an entire quart when I drove to NY (725 miles, and it was full when I left.) I was there a week and went through another quart. I checked my PVC and it was "sticking." Replaced it and it hasn't used more than an 1/16 quart in 2,500 miles... so far so good.
Also check for a leak: valve covers, timing chain cover and seal, oil pan, and worst of all would be a rear main seal leak (hardest to change.)
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Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride ![]() American Born, Country by the Grace of God ![]() 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! |
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#5 |
Registered User
Join Date: Apr 2006
Location: MinneSNOWta
Posts: 1,381
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Re: oil consumption
could be as simple as a valve seal (probably notice a little smoke at startup after it's been stiing a while), or a minor leak someplace.
If the truck isn't billowing smoke, and you don't allow the oil level to get too low, I wouldn't worry about it too much. Before i pulled the engine in my 84 camaro, it was using about a quart every couple weeks. I drove it this way for 4 years, across country, all over the place and had no issues. What finally did the engine in, was a bad waterpump, i probably could've driven the motor for a couple more years before i needed to address the problem
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2003 GMC Sierra 1500 WT 1995 Nissan Hardbody 2016 Hyundai Veloster Turbo DC2 (SW/AW) Clyde W. Harvey USN "Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery" Winston Churchill Last edited by brak; 02-08-2007 at 03:08 PM. |
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#6 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: oil consumption
An engine that is not run much, or driven on only short trips, or has a misadjusted carb can also burn more oil than normal.
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#7 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: oil consumption
If your intake manifold gasket has just created a small leak (between the lifter valley and one of your intake ports, the oil consumption will be up and the motor will appear to be running normal and clean. I have a buddy that has been fighting this on his Corvette motor for a couple of years, since his last rebuild and we just found that the gasket had not sealed in one place. He would use a quart every 500 miles.
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#8 |
Alright Alright Alright
Join Date: Mar 2004
Location: Midland, Texas
Posts: 1,672
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Re: oil consumption
the motor is fairly new. it only has 30000 miles on and the heads were brand new s/r heads (completely new but doesnt mean that they could be leaking). The engine is acutally brand new from oilpan to carb. the truck is my daily driver and i drive it on long and short trips. i have about 600 plus miles on it since christmas. every thing seems to be tight on gasket wise. i also used a bead of silicone on the intake ends. there are also no leaks where i park. the truck runs extremely strong and shows no sign of being worn out. ill look into the pcv valve.
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1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies |
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#9 |
Registered User
Join Date: Mar 2004
Location: Hoytsville, Utah
Posts: 3,365
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Re: oil consumption
I don't know if you would have any around where you live, but if there is a freeway with a long hill on it, this is how I look for oil burning: Get up to speed or a little over and then let off and coast, in gear, with someone behind you with bright lights (do this at night) After a mile or two, put it to the floor. If you are burning any oil, it will show up in the lights behind you.
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'68 Panel Project Boogie Chillin' '68 C-10 Ol' Green |
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#10 |
~Rest In Peace~
Join Date: May 2005
Location: CALIFORNIA NOR CAL
Posts: 9,707
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Re: oil consumption
the dipstick didnt shrink did it
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is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex |
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#11 |
Registered User
Join Date: Aug 2006
Location: Bakersfield,CA
Posts: 7,893
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Re: oil consumption
you should be able to rev it up sittin still and hang out the door so you can see the exhaust or have someone watch for smoke and if you have a tach it makes it easier to know where it is but i could rev mine and see the smoke come out but that was before i changed my valve stem seals now theres no smoke but goodluck with finding it
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-steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME |
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#12 |
Alright Alright Alright
Join Date: Mar 2004
Location: Midland, Texas
Posts: 1,672
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Re: oil consumption
thanks for the tips guys. i do have a tach and ill try it out and let yall know.
__________________
1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies |
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#13 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: oil consumption
DON'T rev to much in the driveway. This is the hardest thing that you can do to your motor. If you do this, it should be under a load. Doing burn outs is not as hard on a motor as doing it without the tranny engaged. When you let off that motor, the rods and crank are basically running without drag and causes a feedback to the engine frame. This is what destroys rods and the lower end.
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#14 | |
Registered User
Join Date: Aug 2006
Location: Bakersfield,CA
Posts: 7,893
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Re: oil consumption
Quote:
ive never heard that before,i always heard reving didnt hurt it as long as you didnt redline it, but i will keep that in mind
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-steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME |
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#15 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: oil consumption
I have a a couple of engine builders in my area, that sponsor the thought of revving the motor is bad, quite a bit. Taking a motor up with a load is no problem, just so there is something for that torsional torque to be absorbed into. Other wise the crank and the rods are the absorbers.
Last edited by piecesparts; 02-10-2007 at 10:12 AM. |
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#16 |
Senior Member
![]() Join Date: Aug 2004
Location: Centennial, CO
Posts: 2,951
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Re: oil consumption
I'll second the intake gasket leak theory. I just resealed mine for that reason. If you have an aluminum intake and use the stock gaskets it may start sucking oil. Once it starts, it just gets worse.
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ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ |
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