I changed my oil last weekend and this was the first time I had opened the hood in a while and I noticed a spot of oil on top of the valve cover right where it drops off to the lower back part of the valve cover. It wasnt a lot but it was a large spot spread very thin. I changed the oil, gunked the engine compartment and called it a day. I checked it today and the spot is forming again (it has been 1 week). I searched all over with a flash light and didnt see anything, I rubbed my fingers on the tubes, hoses, and fittings and they are all clean. If it was lower I would not even worry about it but how the heck does oil get right up on the top like that??? The truck is at 23,000 miles.

 

Small crack in the valve cover???

 

I checked but didnt see anything, unless its right at the point of the angle but I would imagine that would be unlikely?

 

Do you have an oil pressure gauge? If you do could be a leaking line?