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Discussion Starter · #1 ·
So I've been noticing an oil smell, I popped the oil fill cap off while idling and have blow by coming out of the cap. Crawled under the truck and found that my blow by tube was wedged against my frame and spewing oil under everything. I re-routed it but noticed that there seems to be too much oil coming from the tube. Checked oil and noticed I was about 3 quarts low after 4200 since last oil change. Theres no way I should be losing 3 quarts in 4000 miles. I changed my oil yesterday so I can start watching it closer. I've been told that blow by coming out of the cap means engines about to go and I should get rid of it. Advice?????
 

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I'd wait and see what happen's. Sounds like you fixed the issue, but keep a close eye on it. Also check your pcv system under the plastic valve cover. Just make sure it all works and is clear and free flowing. No kinks, and replace any worn hoses with fuel emissions line hose or OEM, NOT coolant hose. Fill out your signature so we know what you got.
 

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Discussion Starter · #3 ·
Ok thanks. I checked the black box under the valve cover, seems to be clear. Is there not any kind of filter thats supposed to go in there? After re-routing my blow by tube I took the cap off again and still have blow by coming out of the cap. Sorry.... its a 2004 2500
 

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So I've been noticing an oil smell, I popped the oil fill cap off while idling and have blow by coming out of the cap. Crawled under the truck and found that my blow by tube was wedged against my frame and spewing oil under everything. I re-routed it but noticed that there seems to be too much oil coming from the tube. Checked oil and noticed I was about 3 quarts low after 4200 since last oil change. Theres no way I should be losing 3 quarts in 4000 miles. I changed my oil yesterday so I can start watching it closer. I've been told that blow by coming out of the cap means engines about to go and I should get rid of it. Advice?????
I am going through this right now, have you noticed your RPMS higher then normal? Does the RPM needle bounce around?

The beginning of my problem was a crack in the rear main seal all the way at the top, it eventually lead to higer oil consumption, erratic RPMS, and dropping a bearing for # 6 into the crank shaft, It will cost me just as much to rebuild it then to replace it. I have an 06 5.9l 6 speed manny, the prices I have gotten on a long block is around 6400 USED, new runs 9235 to 14k.
 

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I am going through this right now, have you noticed your RPMS higher then normal? Does the RPM needle bounce around?

The beginning of my problem was a crack in the rear main seal all the way at the top, it eventually lead to higer oil consumption, erratic RPMS, and dropping a bearing for # 6 into the crank shaft, It will cost me just as much to rebuild it then to replace it. I have an 06 5.9l 6 speed manny, the prices I have gotten on a long block is around 6400 USED, new runs 9235 to 14k.
I feel your pain ............ Just curious - What is your miles on odometer????
 

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279,841 BUT I smelled the oil burning right after a clutch blow up and didn't think twice about it until the rear main blew out completly and dumped the oil and dropped the bearing SUDDENLY! When they took it apart the mech asked me if I had been smelling burnt oil, my RPMS were acting weird (red lining at 74 MPH), and excessive blow by under the truck, I have a 3500 and go to docks with limestone foundations and ALWAYS had a HUGE cloud of dust around me when I drove throug them so I didn't think anything of it.
 

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Discussion Starter · #7 ·
Nope no problems with the RPM's. I only have 92K on my truck. I bought it from a dealer and my fear is that the guy that had it before me ran it into the ground. If I keep burning oil like this I'll probably get rid of it.
 

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mjrogers,
I'm going through the same thing myself, I recently bought a 2005 & the previous owner ran it hard. It burned 2-1/2 quarts in the last 4000 miles, I've got 98,000 on the truck & I have noticed the oil smell too. When I pull the oil cap I can see a faint cloud of smoke.

I took it to the dealer to test the cylinders & injectors, it came back with a clean bill of health. They told me it was normal for it to burn a "little" oil between changes.

The bill was $615 to check each cylinder & the injectors, dodge paid $515 of it. I'm not happy with it burning oil but they assured me that everything was fine.
 

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this ain't your momma's Honda Civic 4 banger.

all Cummins use some oil. long stroke high compression diesel engine with high linear piston speeds and very high ring pressures on combustion stroke.

2 1/2 quarts per 4000 miles is only about 3/4 qt per 1000.
5.9 that pulls heavy all the time will burn 2 qts per 1000 as normal oil useage.
part of it is vaporized oil that is ejected through the crankcase tube.

light puffs out the tube are normal warm engine function, mostly combustion gas ring leakage at idle

Cummins that never are loaded with heavy pulls and are only used for freeway commuters seldom break in the rings/cyl walls. they will use oil more than normal
 

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I change my oil every 7000 miles and use mobil delvac 15w 40 about a week before it was time to service i noticed a burnt oil smell what could that be? I have 47,000 miles and I pickit up from the dealer in the morning for a white smoke at startup issue. They tell me that the 5.9 has a computer update for smoking. Has anyone heard of this also?
 
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