Background.
1990 SW20 G-Ltd Owned since 1995 and has 178 Ks on the clock. (purchased at 13000 Ks )
2 Years ago I had the Dizzy seals, Rocker Cover Gaskets and Crank Oil seals replaced. It was a major service .... timing belt changed..reco alternator (old one full of oil ) coolent flush ( no problems ) and other misc stuff done.
 
I have just noticed oil leaking again slightly on driveway and have no idea where it's coming from.  Have checked the engine level and no issues there.
I have taken photos and there seems to be a fair amount of oil around a cylinder shaped thing.... no idea what it is.
The photos are all around the general area to give you an idea what parts are clean and what aren't.  I gave the gearbox housing a wipe but the dirt didn't appear to be oily. Photos taken directly underneath engine.
Some direction would be appreciated thanks.

 

assume it is leaking down from above whatever the cylinder shaped thing is. Not bad and slow over time. Probably getting worse. timing cover?

nick12

assume it is leaking down from above whatever the cylinder shaped thing is. Not bad and slow over time. Probably getting worse. timing cover?

Can't see any leakage at all around the top part of engine leaking down.
Does anyone know what is directly above/near that cylinder thingy. What is that "cylinder thingy" Highly tecnical terms here I know..

headgasket??

Cylindrical thingy is vacuum reservoir.  Oil looks like engine oil so cam cover gasket or head gasket likely culprits but could also be gearbox axle seal throwing it everywhere.  Check gearbox oil level.

def engine oil, gearbox oil isnt that dark brown usually.

All top gaskets seem ok but will double check. It has been a while since I checked gearbox so will look into that also. Gbox changes are still ok.
Thanks for the replies. Bit annoyed if the top gaskets need to be redone after 2 years.

nick12

assume it is leaking down from above whatever the cylinder shaped thing is. Not bad and slow over time. Probably getting worse. timing cover?

+1
Looks like engine oil.
Oil leaks from the rear edge of the cam cover are very common, and distributor seals can leak too.
You could try tightening the cam cover studs, that may slow it down.
You'd need to remove the distributor to change the seal and then redo the ignition timing. 
 

+2 Looks to be Engine Oil. I'd check the Rocket cover. Common problem on the Gen II's. Check Engine Oil Level. Clean all around the rocket cover and just below. Run the car until its hot. Then recheck all the area's you cleaned to see if oil is present.
 
Good Luck, that's certainly made quite a mess!

Thanks guys....will have another look and see if I can narrow it down.