LLY: oil loss at continuous hi way speed

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I have an ongoing oil problem . pressure gauge giving me low pressure readings, replaced the pressure sending unit ,now good . Still have the loss problem . Rerouted PCV problem still exists . Can't find where the oil is going . went through 5 tanks of fuel around town at speeds between 30 and 45 MPH and didn't use a drop of oil. Went to go back down to florida . At highway speed of70 to75 MPH , went about 180 mile then it started again . The engine slows down . and then goes into limp mode .I pull over ,check the dip stick , no reading on it . Put 2 quartz of engine oil in , then it's good to go . went rite back home .
Im at wits end . Have 100,000 miles on it . Has any body come across or heard of this problem . thanks guys for taking the time to view my problem
 
WVRigrat05

WVRigrat05

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Jan 1, 2011
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If it's not coming out of the pcv, you either have a failing turbo (which would cause an oily tailpipe and smoke if it's too bad) or it's got a bad ring or damaged cylinder wall.

Have you pulled the turbo inlet off and checked for shaft play and/or oil?
 
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WVRigrat05 said:
If it's not coming out of the pcv, you either have a failing turbo (which would cause an oily tailpipe and smoke if it's too bad) or it's got a bad ring or damaged cylinder wall.

Have you pulled the turbo inlet off and checked for shaft play and/or oil?
Click to expand...

the tailpipe has the normal dry soot , on oil in it .if it had a bad cylinder , wouldn't it run a little rough . it runs very smooth and has power . why wouldn't it use oil at lower speeds , this only happens at high speed .
 
WVRigrat05

WVRigrat05

Wound for sound
Jan 1, 2011
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My friend has a bone stock 98 twelve valve with 85k miles. He can putt around town for a month and not burn a drop, he hits the highway and it's pukes a qt or more depending how far he goes right out the pcv vent. Truck has a nice black undercoating.
 
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WVRigrat05 said:
My friend has a bone stock 98 twelve valve with 85k miles. He can putt around town for a month and not burn a drop, he hits the highway and it's pukes a qt or more depending how far he goes right out the pcv vent. Truck has a nice black undercoating.
Click to expand...

I did a PCV reroute and just looked in the tube and its dry
 
2004LB7

2004LB7

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Just think, if it keeps using oil at that rate you will never have to do an oil change as it will always be fresh :roflmao:
 
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WVRigrat05 said:
If it's not coming out of the pcv, you either have a failing turbo (which would cause an oily tailpipe and smoke if it's too bad) or it's got a bad ring or damaged cylinder wall.

Have you pulled the turbo inlet off and checked for shaft play and/or oil?
Click to expand...

I'll look into that this weekend thanks
 
WVRigrat05

WVRigrat05

Wound for sound
Jan 1, 2011
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French Creek, West Virginia
That's just a easy check. After you verify the turbo is good, I'd do a compression test. Putting around town isn't making the cyl pressure, RPM's and heat like driving down the highway.
 
THEFERMANATOR

THEFERMANATOR

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Have you pulled the oil fill cap while it's running to see if you're getting alot of blowby coming out? I know sometimes the pcv system won't show alit of pressure when the oil fill cap will.
 
Awenta

Awenta

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Sep 28, 2014
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It's not the speed it's sustained rpm.

I'd go do a few wot pulls and see what happens.

Sent from my SM-N910V using Tapatalk
 
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the truck is an 05 2500HD silverado LT 4X4 crew cab with 8' bed has a diablo chip , 5 inch exhaust , AFE intake and filter , EGR block off . At 70-80 I get 25 MPG on highway also have an 03 jetta TDI very happy with it . with the work I did to it , I get 58-61 MPG at 75 MPH on the highway .
 
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