The instructions that came with mine said it was oil-less. I never
oiled it in the 18 years I used it. It finally croaked last month and I
replaced it. Started making "klunking" sounds when it started up. Might
be time for you to buy a new one....
When all else fails, check out www.paascheairbrush.com and the parts
list for the compressor. You might be able to replace some of the
wearable items...
Dennis