I checked the oil the other day something I probably should do more often since I found that I was short 3 quarts of oil. The truck has 190,000 mi. My truck doesn't smoke, there isn't any blow by, but I need to check the intercooler line. There are also no drips that I have found and especially no oil on the ground. I have no Idea where the oil is going! Does anybody have any Ideas. I called my mechanic and he thinks an injector is filling up the oil pan but I don't think its possible because I replaced the injectors when I got the truck 3 yrs ago! Anybody know how much it would cost to fix the problem if there is oil in the intercooler line? Thanks for any advice guys!

 

ok, if it was using oil then an injector would not be even close to the issue ... #1

#2 check your turbo out .. check for slop and for/aft loosness..... if nothing there , inspect underside closley for leaks/seeps......

How long has it been and is the 3 qts a regular problem ? what oil are you running ?

 

check your coolant. is it milky looking? Its possible that it could be a bad oil cooler and its just going in the radiator.

 

Good point ....

 

Well a little update on the truck..... I am using a quart about 4,000 mi... I pull a landscape trailer and drive this truck everyday. I hit about 194,000 and either the injector got stuck open or I have a mechanical failure in the #4 piston. Shop did a diagnostic test and the rate on the 4 cylinder was around 10-12 I believe. Once the 4 cylinder was shot off the chopping stopped. Still haven't found an oil leak. The coolant is not milky, there are no visible oil leaks. Now I am waiting on the truck to get into the shop to tear it apart.

 

thats not enough oil to be concerned with .. most likley its because your working the engine good and hard .... A good running engine will consume a bit of oil .. 1 Qt @ 4K is more than ok ...

 

I would NOT say that is a safe amount. Especially for a duramax, it's unusual.

 

I agree. The duramax does not normally consume much oil if any at all. My lb7 needs no extra oil between oil changes and i dont baby it.

It could be possible that the stuck injector washed the cylinder wall and now the wall/rings are scratched and burning oil.

You could try water injection for a few thousand miles to clean up the cylinders and see it stops using oil. A cheap setup could be rigged pre-turbo with the windsheld washer pump that you could use just for this.

 

^^^

 

My LB7 uses a bit of oil .. never smokes runs awesome .. ? maybe we have the same issues ???