I have a problem with oil leaking down backside of engine, firewall side. It is very tight back there, I had air cleaner box off and was looking from top and bottom, I cannot see source. Oil filter was not leaking but possibly the gasket for the oil pressure sender mounting piece where it bolts to the engine is one possibility. I could not see up to head gasket area, but another possibility. Are there any other things up there that could be leaking.
Car has 240,000 miles but still runs great and would like to solve the issue. could pull intake manifold but then will not be able to run engine to spot the leak?

Any ideas?

 

I've moved this to general tech - please don't post questions in the DIY section.

Buy a new oil pressure switch (less than $15) and replace it.

 

I did replace replace oil pressure switch but I believe gasket under oil filter adapter was leaking so fixed that and problem is solved. No more drips on the driveway!
:-)