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Old 08-09-2017, 11:05 PM   #1
fishEH
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Default Oil consumption

D1 with 231,000 miles. Got back from a 2 week/3400 mile trip amd only got 2quarts of oil in my drain pan!!!
Never saw any huge oil spots on the ground, just normal quarter size drips.
No oil in the coolant.
After the 1000 mile drive home I noticed "oily" looking spots on the rear bumper of the truck.
So I assume its burning oil. What kind of repair am I looking at?
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No matter how hard you stir it you won't make chocolate ice cream out of a bucket of shit
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Old 08-09-2017, 11:49 PM   #2
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Default Re: Oil consumption

Blue smoke?
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Old 08-10-2017, 01:32 AM   #3
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Default Re: Oil consumption

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Originally Posted by ERover82 View Post
Blue smoke?
I didn't see any smoke the whole trip.
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'98 D1 Trail Rig. Lockers and whatnot. Retired
'96 D1 Daily Driver. OME lift, 235/85/16 Toyo AT's.
'95 D1 Project Truck.
'94 D1 Too good to pass up. OME lift, 265/75/16 BFG AT's, Detroit/TruTrac, etc

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No matter how hard you stir it you won't make chocolate ice cream out of a bucket of shit
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Old 08-10-2017, 01:35 AM   #4
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Default Re: Oil consumption

Hi, my experience is to see little oily spots when D1 or D2 make long drives at continuous higher​ speed, but oil comes out from transfer case seals, with no noticeable level drop.
Some gurus find that high TC oil temp increases pressure and makes oil thinner producing these small spots. In order to decrease TC oil temp somebody​ designed a sumpf cap with 2 more liters oil capacity.. Transfer cases with these oil caps work cooler, and don't drop oil.

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Old 08-10-2017, 02:13 AM   #5
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Default Re: Oil consumption

Sorry, I was referring to engine oil being low, not TC.
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'98 D1 Trail Rig. Lockers and whatnot. Retired
'96 D1 Daily Driver. OME lift, 235/85/16 Toyo AT's.
'95 D1 Project Truck.
'94 D1 Too good to pass up. OME lift, 265/75/16 BFG AT's, Detroit/TruTrac, etc

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No matter how hard you stir it you won't make chocolate ice cream out of a bucket of shit
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Old 08-10-2017, 06:47 AM   #6
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Default Re: Oil consumption

Quote:
Originally Posted by fishEH View Post
D1 with 231,000 miles. Got back from a 2 week/3400 mile trip amd only got 2quarts of oil in my drain pan!!!
Never saw any huge oil spots on the ground, just normal quarter size drips.
No oil in the coolant.
After the 1000 mile drive home I noticed "oily" looking spots on the rear bumper of the truck.
So I assume its burning oil. What kind of repair am I looking at?
Rings or valve quides I would think.
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Old 08-10-2017, 08:40 AM   #7
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Default Re: Oil consumption

Assuming you started with more than 2qts and you've already checked the valve covers the first order of business is figure out if it is leaking out or burning out.

On a separate note, you drove a Disco I 3400 miles without periodically checking critical fluids?

Shame on you.
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Old 08-10-2017, 10:07 AM   #8
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Default Re: Oil consumption

I did an oil change right before the trip, 7qts of 15w-40 and a Napa Gold filter.
I haven't checked valve covers. And no, shamefully I didn't check the oil on our 2 week trip. I've owned three other D1's and never been more than a quart low at 3000 mile oil change intervals. I guess its just weird that 5qts disappeared without any huge puddle under the truck and no smoke.

I suppose its possible that a leak developed towards the end on the trip, in particular on the way home where much of the driving was at night/in the dark.

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Originally Posted by WaltNYC View Post
Assuming you started with more than 2qts and you've already checked the valve covers the first order of business is figure out if it is leaking out or burning out.

On a separate note, you drove a Disco I 3400 miles without periodically checking critical fluids?

Shame on you.
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'98 D1 Trail Rig. Lockers and whatnot. Retired
'96 D1 Daily Driver. OME lift, 235/85/16 Toyo AT's.
'95 D1 Project Truck.
'94 D1 Too good to pass up. OME lift, 265/75/16 BFG AT's, Detroit/TruTrac, etc

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No matter how hard you stir it you won't make chocolate ice cream out of a bucket of shit
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Old 08-10-2017, 12:17 PM   #9
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Default Re: Oil consumption

In the Disco manual it states that the engine will consume (x) amount of oil for so many miles.
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Old 08-10-2017, 12:39 PM   #10
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Default Re: Oil consumption

It's got to be leaking somewhere. Is your transfercase black? Is the back of the oil pan wet? Is the oil pressure switch spewing out oil? Maybe you can't see the leak because the oil is clean?


If it is burning I think you'd see or smell it How is the mesh in the valve cover breather? Maybe pull the upper plenum and see if it's swimming in oil?
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Old 08-10-2017, 01:11 PM   #11
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Default Re: Oil consumption

Quote:
Sorry, I was referring to engine oil being low, not TC.
Yes understood, I wanted to express that dots are lost oil. To make sure you are not burning it at least in excess you can do finger-test: in exhaust pipe. If charcoal inside is sticky, and on outer edge of pipe a bit oily confirms that it is burning.

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Old 08-10-2017, 01:37 PM   #12
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Default Re: Oil consumption

Did you do the oil change or did you have somebody else do it? It's possible they only put 2 quarts in if it wasn't you.
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Old 08-10-2017, 03:30 PM   #13
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Default Re: Oil consumption

Sounds like I've got some investigating to do.
I did the oil change myself so I'm pretty positive I added more than 2qts. But I did oil changes on three of my vehicles that day so I guess anything is possible.
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'98 D1 Trail Rig. Lockers and whatnot. Retired
'96 D1 Daily Driver. OME lift, 235/85/16 Toyo AT's.
'95 D1 Project Truck.
'94 D1 Too good to pass up. OME lift, 265/75/16 BFG AT's, Detroit/TruTrac, etc

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No matter how hard you stir it you won't make chocolate ice cream out of a bucket of shit
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Old 08-10-2017, 09:32 PM   #14
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Default Re: Oil consumption

Quote:
Originally Posted by fishEH View Post
231,000 miles.
Operative words.
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Old 08-11-2017, 07:20 AM   #15
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Default Re: Oil consumption

I do remember some engines pulling oil from the breather hose from the valve cover. It should have a little plastic restriction in the port on the valve cover. If that's missing it will pull oil from there. I think because of the distance you went to burn 4 arts you might not have had a lot of smoke from the tailpipe. Maybe people driving behind you could see a little but from the drivers seat maybe not.
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Old 08-12-2017, 05:15 PM   #16
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Default Re: Oil consumption

Mine has similar miles and leaks a bit from valve cover gaskets. It looses a QT every thousand miles.
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