17,200 miles on '05 F-150 5.4l. All stock. Changed oil/filter/air filter (all MC) at 15,000 miles. Runs like a champ with no other issues since buying the truck new. Within the last two weeks of my normal, nothing unusual commute to/from work, I noticed a burning oil smell coming from the vents inside the truck. I checked for leaks/seeping and the engine is clean enough to eat off of. No oil smell coming from under hood. I park in the same spot at home and work and there is no oil on the ground. The oil level was a little less than a quart low. I slowly add/check oil to keep the level exactly at the top fill mark and always check my fluids every Sunday. Last Sunday I added < 1 quart oil to bring the oil right to the top of the full mark. One week later, I still have the smell and just added < 1 quart oil. I have only used MC 5W20 w/MC 820s filter w/ 3000 mile changes. For the year I have owned this truck, the oil level has never went down between oil changes. The weather has been cool if not down right cold. Predominantely highway travel at +/- 70 MPH. I drive about 1mile through the city after exiting the freeway both at work and home. I only smell the oil through the vents when I arrive at work/home and the engine is at idle right before shut down. I always leave the vent doors in an open setting. I never turn the climate control **** "off". Is there a history of this happening to anyone or any recalls/TSB's on this issue? Any ideas?

 

Better take it in to your dealer you have some internal problem not many 5.4 use any oil at all in 3K mi.

 

Take it back. It's under warranty. I would love to be able to "not worry" about problems like that.