Numerous tech log entries but no action!
If you're refering to the BA 757's I can assure you we always took tech log entries for oily smells seriously and spent hours on ground runs identifying the causes. Generally APU or Engine oil seals were the initial cause on the 535 engined 757's but on the E4's it seems to be overfilling the oil tanks causing it.
There is a fix in service at the moment and a lot of effort is going into it.
Spare a thought for us who spend hours on the flight deck sniffing the stuff and trying different bleed configs to figure where it's come from.
For info - all the G-BIK? and G-BMR? series a/c have now gone and are either DHL Freighters or waiting to become.