Normal Engine Oil Use?
Trying to Gain Knowledge
Joined: Jun 2003
Posts: 1,571
Likes: 2
From: Ezzell, TX
Justin, every truck is a little different. I have been fortunate to not have the issue of oil consumption, but others have had a small amount. I wouldn't be too concerned about a quart or two between oil changes. Just check all the areas where there could be a leak. HPOP lines on top of motor, HPOP itself, Oil Cooler gasket and o-rings under drivers side of engine. Just keep an eye on it and make sure it doesn't get worse.
Additional Info: To add to the above comment, if you aren't seeing blueish smoke out of the tail pipe and you don't have a coating of oil in the coolant, it isn't a significant concern. Just check for potential leaks.
Additional Info: To add to the above comment, if you aren't seeing blueish smoke out of the tail pipe and you don't have a coating of oil in the coolant, it isn't a significant concern. Just check for potential leaks.
Senior User
Joined: Dec 2010
Posts: 411
Likes: 0
Just to add to the crowd, I don't seem to consume oil either. I don't think a quart per 5k is something to be worried about especially with 15 quarts in the pan. More than that and I would start looking around. I always have some left over out the 4 gallons I buy for an oil change so it wouldn't bother me to top off a quart here or there.
A gallon per 1k!? That seems problematic to me...no matter what you're doing with the truck at the time.
A gallon per 1k!? That seems problematic to me...no matter what you're doing with the truck at the time.
Senior User
Joined: Dec 2010
Posts: 411
Likes: 0
Justin, every truck is a little different. I have been fortunate to not have the issue of oil consumption, but others have had a small amount. I wouldn't be too concerned about a quart or two between oil changes. Just check all the areas where there could be a leak. HPOP lines on top of motor, HPOP itself, Oil Cooler gasket and o-rings under drivers side of engine. Just keep an eye on it and make sure it doesn't get worse.
Trying to Gain Knowledge
Joined: Jun 2003
Posts: 1,571
Likes: 2
From: Ezzell, TX
I even went back and added some additional info to the original post of mine. Hopefully, his issues are minor. Let it warm up and get it good and checked out.
Postmaster
Joined: Jan 2012
Posts: 2,693
Likes: 3
From: West of Chicago
My ex uses about 1.5 -2 qts per change. T6 fl1995. In the 15,000 miles I've owned it for its always been like that. I have a few leaks to adress In the spring. FWIW my gas 5.4 goes through 1.5 qts in 3,000 miles.
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
The 'normal operating range' allows for 2qrts 'low'. I never add oil until it gets to the bottom of the crosshatch on the dipstick. I have read several times that people 'use' more oil trying to stay at the top of the crosshatch area.I can confirm this engine will run fine until it is 2.5 gallons low on oil - and even then it just won't run, it doesn't hurt anything. Not that I recommend running out of oil, but in my >300k miles owning PSD's - I've had a couple of catastrophic oil leaks...
) 6637 to solve the problem. Oil consumption back to normal <2qrts/5k miles. When I have some $$$ to throw at this 'ergonomic' problem - I will try to resolve it. I was kinda hoping the S366 would be an improvement over the 38R - but, no luck. 
Since I no longer spend 12+ hrs a day dragging my living quarters from job-to-job all over the country, its not really a priority. Meanwhile, all the younger guys LOVE to hear my turbo whistle and roar...
Postmaster
Joined: Jun 2010
Posts: 2,555
Likes: 9
From: Longview, TX
I can confirm this engine will run fine until it is 2.5 gallons low on oil - and even then it just won't run, it doesn't hurt anything. Not that I recommend running out of oil, but in my >300k miles owning PSD's - I've had a couple of catastrophic oil leaks...
I think Roland (maybe someone else) had a similar story. Never adds between changes, then one day it won't crank, put a couple gallons in, fires off, back to never adding between changes. Where and why did it go? Who knows.
Lead Driver
Joined: Feb 2000
Posts: 5,374
Likes: 46
From: Palm Bay, Florida
Mine uses about 2 quarts every 5k with Rotella Synthetic 5w40 and FL-1995 filter 120k on the clock, I have no leaks and no smoke......
Combo towing and empty.....
Combo towing and empty.....
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Laughing Gas
Joined: Sep 2007
Posts: 1,051
Likes: 4
From: Caro, MI
Justin, every truck is a little different. I have been fortunate to not have the issue of oil consumption, but others have had a small amount. I wouldn't be too concerned about a quart or two between oil changes. Just check all the areas where there could be a leak. HPOP lines on top of motor, HPOP itself, Oil Cooler gasket and o-rings under drivers side of engine. Just keep an eye on it and make sure it doesn't get worse.
Additional Info: To add to the above comment, if you aren't seeing blueish smoke out of the tail pipe and you don't have a coating of oil in the coolant, it isn't a significant concern. Just check for potential leaks.
Additional Info: To add to the above comment, if you aren't seeing blueish smoke out of the tail pipe and you don't have a coating of oil in the coolant, it isn't a significant concern. Just check for potential leaks.
Thread Starter
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Laughing Gas
Joined: Sep 2007
Posts: 1,051
Likes: 4
From: Caro, MI
No I am saying 1/4" from the actually bottom of the dipstick. Far below the crosshatch.
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
Now I smell what yer steppin' in!! Yes, that would be a concern. And I agree 1qrt/1000mi is excessive enough to be a concern.Soooo, to re-state your question - where can it go? Could leaky turbo seals allow oil to be consumed without being 'obvious'? Injector o-rings?
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Laughing Gas
Joined: Sep 2007
Posts: 1,051
Likes: 4
From: Caro, MI
OH! Now I smell what yer steppin' in!! Yes, that would be a concern. And I agree 1qrt/1000mi is excessive enough to be a concern.
Soooo, to re-state your question - where can it go? Could leaky turbo seals allow oil to be consumed without being 'obvious'? Injector o-rings?
Now I smell what yer steppin' in!! Yes, that would be a concern. And I agree 1qrt/1000mi is excessive enough to be a concern.Soooo, to re-state your question - where can it go? Could leaky turbo seals allow oil to be consumed without being 'obvious'? Injector o-rings?
Postmaster
Joined: Jun 2010
Posts: 2,555
Likes: 9
From: Longview, TX
For 1000 miles, you're looking at about 60 gallons of fuel +\-. I know of a couple guys that add a quart of cheap engine oil to the fuel tank every fill up to compensate for the ultra low sulphur diesel (that's a different topic altogether), but to my knowlege that doesn't create smoke, and that would be about equal to 2 quarts per 1000 miles, again, give or take. I'd say its very possible that 1 quart burned per 1000 miles will not produce noticeable smoke.
Trying to Gain Knowledge
Joined: Jun 2003
Posts: 1,571
Likes: 2
From: Ezzell, TX
Would Justin need to replace his injector o-rings? That is something I have planned for this fall. I have 225k on mine, he has 207. Jeff you have around the same 225 that I do. You replaced your o-rings. I think that the truck being 12-13 years of age, the o-rings would be a normal replacement item. I plan on replacing the rest of my o-rings and line sleeves this summer/fall. Just want to button it up for the next 225k.
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Laughing Gas
Joined: Sep 2007
Posts: 1,051
Likes: 4
From: Caro, MI
Would Justin need to replace his injector o-rings? That is something I have planned for this fall. I have 225k on mine, he has 207. Jeff you have around the same 225 that I do. You replaced your o-rings. I think that the truck being 12-13 years of age, the o-rings would be a normal replacement item. I plan on replacing the rest of my o-rings and line sleeves this summer/fall. Just want to button it up for the next 225k.