My 2000 Nissan frontier I have been smelling oil burning kind of like oil was spilled on the headers but I haven't added any oil lately. I checked the dip stick and the oil is in normal range but needs to be changed. I started looking around I could see a little line of oil just below the valve cover.
This morning while the truck was still warm I used break cleaner ( to cold to rinse after using engine cleaner) and got all the burned oil off. I saw a little more oil run out from under the valve cover so I went in the house and got a screw driver and tightened all the Philip's head screws holding the cover on the engine. they all where a turn or two loose.
now I just got back from driving it and didn't have the smell and the engine seams to have more power and triode response.
Could the loose valve cover cause the engine to loose some power?
