3800 w/ oil leak on top

I have a 2001 Monte Carlo SS w/ the 3800 V6. I've recently noticed a little oil pooling and sludge on the top of the engine in the valleys between the valve covers and intake manifold. I'll also occasionally get a oil smell in the cabin. At first, I thought it was the UIM gasket since there appears to be some oil around the seam and it looks like a plausible source for the leak. However, after a lot of reading, I can only find reference to coolant leaks from this gasket -- not oil. Could it be oil leaking from the valve cover gaskets instead, or is the UIM gasket still likely?

I just changed the oil and didn't notice any coolant in it. Also, I haven't noticed any coolant loss or any oil in the coolant.

Going to the proper Monte forum below.

Most likely it is the valve covers, clean the area and recheck.

Most likely it is the valve covers, clean the area and recheck.

Thanks, I'll try that. The more I think about it, the more I think it has to be the valve covers.

I posted in nonspecific b/c the 3800 is in a lot of other models besides Monte Carlo.