I agree with 'tpolk', over-lubing is probably more harmful to an air tool than under-lubing. Ironically, for our air compressors, 360 HP, 1500 PSI, we used a 30W non-detergent oil that the MSDS sheet read almost exactly the same as the air line lubes, just a different viscosity. Call it motor oil, call it special air line oil, the MSDS sheets read the same as to what the oils contained, and their base product-refined crude oil(s). For air tools, automatic air line lubricators, we used just plain old 5W non-detergent oil. Our air line lubricants, and any special 'air line lubricants' we may have bought had the MSDS sheets and I had to read/understand them. I was in a position to have the MSDS sheets on ALL lubricants we used in two of our plants and ALL lubricants we used were petro based. ALL of the air line, air tool lube oils I have ever ran across was petroleum based oils. In My Honest, Educated, opinion: air tool lubricant is lubricating oil. I worked in industrial maintenance for 38 years, working with all types of pneumatic equipment, tools, and air compressors. 'Wildies' post caught my attention.I'm not cutting 'Wildie'. Just a few drops every so often, depending on use. I use plain ole' 5W non-detergent motor oil, straight from the auto parts store, in my nailers, air grinders, air drill, etc. As far as using synthetics-think twice: Some 'O'-rings in air tools are not designed to use with synthetics and the O-rings will deteriorate very quickly with synthetics.

Airtool tool oil