[sparky309]

I recently changed oil in my '03 duramax. Third time I have done it since I bought it, and third time I have encountered this problem. For a week or two after I change oil I smell Burnt oil smell in the exhaust. I am sure I have not spilled or dripped oil while changing. Paid very close attention to this detail on saturday when I changed the oil. I use Rotella oil and Wix filters. The truck only has 85k on it, and I am second owner, first owner had the truck serviced at the dealership where i bought it, it was serviced properly before I bought it with 65k on it. Is this a problem I should be concerned with? is this Blow-by? Why does it come and go? anyone else have this problem? Is it the oil? reason I ask is last spring I changed oil in my kubota compact tractor and used rotella, and noticed the same thing, burnt oil smell the first few times I mowed grass. Any input is appreciated. :help

 

[Tankercomm]

Well new oil does tend to "clean" things up a bit because of the detergents. Maybe its just cleaning the junk out? The question I have is how long until the oil on the dipstick starts getting dark? On my truck I will usually get about 5K before it even starts turning darker. I think this could be a sign of blow by. JMO

 

[setexan]

Wow, all three diesels I have had, the oil is black after the first time I start it.
I don't think the oil smell you are getting has anything to do with the oil brand. My LB7 use to have a burnt oil smell after every oil change. I think it had more to do in my case with the oil draining on the skid plate, but if you have a burnt oil smell and the oil level is okay then, I really wouldn't worry about.

 

[Tow Master]

I wouldnt worrie about it at all. IMO Its just coincidence. I changed the oil in my truck with 5,000 miles on it and filled it up with new oil... It was a black as it was before I changed it!

I doubt your getting blow by. I bet its the new detergent like suggested if anything.

 

[sparky309]

I change oil every 5k, also fuel filter every 5k. About $90 dollars do it all, but well worth it compared to the expense of an over haul or injectors or pump. Oil is fairly black at 5k intervals, but not he worst I have seen. I have grown up around motorsports and do not know why I get this condition every time I change oil. Also would like to add, if anybody is looking for a good exhaust system, I just installed a Magnaflow 4" last night and I LOVE IT! Truck had straight pipe on it when I bought it. I did not care for the interior noise, especially when I towed my trailer. This system has a muffler, no cat and significantly reduces interior noise, but still delivers a nice tone as it drives by without getting "blatty" like the old glasspack mufflers.

 

[LB7_MAXd]

you have nothin to worry about the burnt oil smell is coming out of the exhuast from tha lubrication of tha turbo tha 04.5 and never have variable turbos adjusted by oil hitting tha turbo vanes so tha oil builds up in the intake side notice tha turbo tube clamps usually have oil build up visable in our case lb7 lubricate and the oil leaks into tha exhaust side nothin bad jus the way it does your usually smelling it after an oil change because tha oil line to tha turbo drains down and when u fill it back up and tha motor pressures it up it has an initail blow of oil into the exhaust


kinda my area of expertise i sell alot of amsoil from my shop and do tha oil changes myself i have 297,000 miles on an 02 lb7 that has never been to tha shop and ive changed the oil on it 4 times since bought in 2002 no leaks no nothin firm believer in amsoil products

 

[LB7_MAXd]

also you should throw a code if it where to have blow by but you can check by jus pulling your oil fill cap while its running if it has air pressure and smoke blowin out then you have a problem if not then your all good