I have a fair amount of oil residue on underside of B18C1 and was hoping you could help identify issues.
The oil seems concentraded around the area between the block and transmission housing on bottom. In addition there seems to be oil around where the shift linkage enters the transmission.
Motor has 180,700. All original except mugen headers and skunk2 manifold
Ideas?

 

Is there any way to put it on jack stands? My guess would be the oil pan gasket, but it's hard to tell unless you can look under and clean it off then see where the leak is coming from. I had some under my B18Cr and it was dripping off my transmission but ended up being my oil pan gasket. GL with that, keep me updated.

 

Check your oil pan gasket, axel seals, or your rear main seal might be going out.

 

also make sure it's not just the Vtec solenoid gasket, that can be easily checked by opening the hood, on the left side of the block by the distributor super easy to replace if that is the case. Makes sure it's all clean in that area, oil could be leaking down from there.

 

rear main seal
oil pan gasket

Most likely both of these are causing the oil leaks, after all, it does have 180k miles and have suffered over a decade worth of heat cycles.

 

This is so very common, i can tell you 99.9% its not the oil pan gasket if its collecting where you say it is. It will come from a few key areas up top as it collects and drips down. Check,

valve cover gasket for leaks,
distributor seal,
vtec solinoid,
worse case head gasket but you would have another thread asking why the engine isnt running right.
my guess distributor seal. It will leak and will collect in the shift linkage area as well as between the block and trans.