Hidden oil leak...HELP!

[Green Mazda]

Over the past couple of weeks I have started notice the smell of oil burning from my truck. I have checked an checked at every possible place i could think of and i see nothing leaking anywhere. I keep my engine bay really clean so when stuff like this happens I can point it out real quick. But this one is eluding me. What are the typicall places on a 3.0L 99' to leak at and where have yall found leaks before in a more unexpected spot? Oh, the oil stick shows now change..so that is kinda confusing me.
Since day one when the truck was bought it has only had full synthetic oil in it and changed every two-three thousand miles, overkill probably but its better safe than sorry I feel. But it is just now on its way to rolling over 100K and leaking oil already in a nearly perfectlly maintained truck.
Some one any one Help. I need to fix this before it gets too bad.

 

[shadetree]

Valve covers.
Intake manifold.
Front and rear crankshaft seals.
Transmission seals, front and rear if auto.
Timing cover.
Oil pressure sender.
Power steering.
Look for oil getting on the exhaust, and maybe you can narrow it down.shady

 

[Green Mazda]

Yeah i checked all of that but the power sterring, that might be it it has been leaking maybe thats it.