Produce hard evidence - it isn't hard to find...
So, if its really that bad, and doesn't get fixed, there will be a nice sticky oil deposit all over the cabin interior and the outlow valve.
When smoking was permitted on aircraft, cabin interiors would be coated in a noticeable layer of tar within a few days of a refurbishment and the outflow valve showed visible contamination after only a couple of flights. By the time a 'C' check came due we had to clean the valves off with isopropyl alcohol or they would gum up completely by the next check.
So, if you want us to believe this problem truly exists, produce visible proof of contamination or shut up about it [photographs will do for now]. Or find another job - flying doesn't seem to be up your street, litigation lawyer seems more suitable.
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Through difficulties to the cinema