Burning Oil

[KingSix]

I just did an oil change about 3 weeks ago, since that time my car has been running a lot better.. until last night, there was a scent of burning oil in the cabin after I came to a complete stop...not strong, but enough to get your attention. When I checked under the hood there was a small amount of smoke coming fron the firewall end of the motor seeming to be coming from above the exhuast manifold but its very hard to see in that confined space, again, not a great deal of smell or smoke, just enough to catch the eye. I checked the oil level this A.M. and there seems to be no significant loss, I checked the coolant also, clear (no oil)...a compression test reveals everything is where it should be ...other than a line being back there what do you guys think it could be ? Unless its the beginning of the head gasket and its not a big enough crack to cause damage, power loss or mixing of fluids yet , I was thinking maybe valve cover gasket ? This just doesn't have the feel of a head gasket ... I was just wondering if some of you guys with M30's have had this experience before ... the pic shows where the smoke is coming from .... almost directly below the filler cap