Burning oil

69fastback · February 14th, 2009, 11:20 AM

My car is using a lot of oil. By a lot, I mean about 1 quart every 500 miles, and it doesn't leak at all. After the engine was built, it was only driven about 50 miles in the first two years, and now it's driven on a pretty regular basis. It has apprx 20,000 miles on it, and it's smoking a little, but nothing real bad.

With the large oil consumption, I decided to run a compression check, and it broke down like this.

#1: 130 #5: 130
#2: 130 #6: 130
#3: 130 #7: 130
#4: 125 #8: 130

I don't think you could ask for much better than that. Could the valve seals possibly be leaking so bad, as to cause 1 quart every 500 miles to disappear? I'm sure they're leaking some, because of the puff of smoke it blows on start up, but there isn't smoke while driving. It smokes some under hard accelleration, and when you let off the gas, but it's not terrible.

Any thoughts?

Katen · February 14th, 2009, 04:31 PM

have your taken the intake off lately? i know that causes massive oil loss. stupid question none of it is leaking right?

69fastback · February 14th, 2009, 05:00 PM

Originally Posted by Katen

have your taken the intake off lately? i know that causes massive oil loss. stupid question none of it is leaking right?

No leaks

Originally Posted by 69fastback

My car is using a lot of oil. By a lot, I mean about 1 quart every 500 miles, and it doesn't leak at all. After the engine was built, it was only driven about 50 miles in the first two years, and now it's driven on a pretty regular basis. It has apprx 20,000 miles on it, and it's smoking a little, but nothing real bad.

With the large oil consumption, I decided to run a compression check, and it broke down like this.

#1: 130 #5: 130
#2: 130 #6: 130
#3: 130 #7: 130
#4: 125 #8: 130

I don't think you could ask for much better than that. Could the valve seals possibly be leaking so bad, as to cause 1 quart every 500 miles to disappear? I'm sure they're leaking some, because of the puff of smoke it blows on start up, but there isn't smoke while driving. It smokes some under hard accelleration, and when you let off the gas, but it's not terrible.

Any thoughts?

460brevill · February 14th, 2009, 07:14 PM

it most likley the valve seals,they can be replaced without pulling the heads.that is where i would start.

RagHead · February 15th, 2009, 12:07 AM

Combo valve seals and/or valve guides. Seals can be replaced with head still on, valve guides require a valve job with heads off.

69fastback · February 15th, 2009, 10:33 AM

That just seems like a lot of oil to be going through the valve seals, but I guess it's a cheap easy thing to try first.

jspagna1 · February 15th, 2009, 11:46 AM

Ya I would say start with the valve seals. I also read that:"After the engine was built, it was only driven about 50 miles in the first two years" This could also be a reason for the problem?
I also read an article in a technical magazine a while back that said:
"High operating temperatures cause lower grade materials such as nitrile to harden and become brittle over time. Eventually, this can lead to cracking, loss of oil control and seal failure. When a valve stem seal loses its ability to control the amount of oil that enters the guide, it can cause a variety of problems."
Good luck.

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February 14th, 2009, 11:20 AM	#1
69fastback Enthusiast 1969 Mustang Mach 1 OLDNSLO Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 812	Burning oil My car is using a lot of oil. By a lot, I mean about 1 quart every 500 miles, and it doesn't leak at all. After the engine was built, it was only driven about 50 miles in the first two years, and now it's driven on a pretty regular basis. It has apprx 20,000 miles on it, and it's smoking a little, but nothing real bad. With the large oil consumption, I decided to run a compression check, and it broke down like this. #1: 130 #5: 130 #2: 130 #6: 130 #3: 130 #7: 130 #4: 125 #8: 130 I don't think you could ask for much better than that. Could the valve seals possibly be leaking so bad, as to cause 1 quart every 500 miles to disappear? I'm sure they're leaking some, because of the puff of smoke it blows on start up, but there isn't smoke while driving. It smokes some under hard accelleration, and when you let off the gas, but it's not terrible. Any thoughts? __________________ New ride http://www.superior-motorsports.com/...aig/craig.html Old ride http://www.superior-motorsports.com/...g/mustang.html old rides engine in new home http://videos.streetfire.net/video/4...285480b970.htm

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February 14th, 2009, 04:31 PM	#2
Katen Regular 1973 Coupe Mustang as fast as the restoration is going Join Date: Jan 2007 Location: Defiance, Ohio Posts: 136	have your taken the intake off lately? i know that causes massive oil loss. stupid question none of it is leaking right?

February 14th, 2009, 07:14 PM	#4
460brevill Hardcore Enthusiast Join Date: Apr 2007 Location: Farmville VA Posts: 1,251	it most likley the valve seals,they can be replaced without pulling the heads.that is where i would start. __________________ i sixing 200 six with 300 hp.

February 15th, 2009, 12:07 AM	#5
RagHead Newbie Join Date: Sep 2008 Posts: 14	Combo valve seals and/or valve guides. Seals can be replaced with head still on, valve guides require a valve job with heads off.

February 15th, 2009, 10:33 AM	#6
69fastback Enthusiast 1969 Mustang Mach 1 OLDNSLO Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 812	That just seems like a lot of oil to be going through the valve seals, but I guess it's a cheap easy thing to try first. __________________ New ride http://www.superior-motorsports.com/...aig/craig.html Old ride http://www.superior-motorsports.com/...g/mustang.html old rides engine in new home http://videos.streetfire.net/video/4...285480b970.htm

February 15th, 2009, 11:46 AM	#7
jspagna1 Regular Join Date: Nov 2007 Location: Connecticut Posts: 56	Ya I would say start with the valve seals. I also read that:"After the engine was built, it was only driven about 50 miles in the first two years" This could also be a reason for the problem? I also read an article in a technical magazine a while back that said: "High operating temperatures cause lower grade materials such as nitrile to harden and become brittle over time. Eventually, this can lead to cracking, loss of oil control and seal failure. When a valve stem seal loses its ability to control the amount of oil that enters the guide, it can cause a variety of problems." Good luck. __________________ 1966 Mustang Coupe Ford Racing 5.0 HO Roller Motor/B303 Cam/1.7 RR TFS TW 205 Heads/Ceramic Coated Tri-Y Headers Edelbrock Performer RPM/Holley 650 DP 8 qrt Milodon oil pan/Griffin aluminum radiator Mallory Distributor/MSD/Holley Electric Fuel Pump 2.5" Exhaust with H pipe/2 chamber Flowmasters Auburn 3:55's rear/Aluminum drive shaft + loop SSBC disc brakes/C-4 wTCI 2800 15x6/15x7 Torque Thrust D's BFG Drag Radials Fiberglass Shelby hood/frt valance/trunk/bumpers

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