Pending Trius approval, I would dare to say the lattest version(s ?) of the Zuiko f1.8 are among the pearls of Zuiko glass.
I think around 7 Zuikos 50/1.8 passed through my hands and some are still with me. But oil within the blades ? This is the first time I hear about, tough all the 7 were and are purchased used
However, due to the tremendous amount of this lense in the market, the alledged $39 for purchase and the higher price CLA sounds to me out of place.
During the last weeks I have been chasing an OM30 (OM-F) and I can report the following: There are several sellers applying ridiculous high prices for OM gear and there are others still realistic.
With a bit of patience and daily search, you are very likely to find within two weeks a highly good looking 50/1.8 with camera attached for below 50 bucks.
Of course the camera, still in great condition, will be of the amateur OM line, like the OM10, OM20, OM30, OM40.
Now it is quite possible that if you look at this very moment you will find crazy prices, but I repeat, this market went wild, but still there are realistic sellers.
For the other sellers it doesn't matter to earn 30 bucks and they prefer to wait a year in the hope to find a dumb buyer. Let them be happy.
Another factor to take into account is that it seems to me that OM gear is more respected (more priced) in the US, than in other countries - So check internationally too.
Cheers,
Ruben