Old fart and old Trane commercial guy chiming in. Also a fellow Northeast TX guy. Marshall was the closest KFC when I was a kid on multiple trips to Barksdale AFB.
Split heat pumps or AC assuming you've got adequate make up air. Also assumes you might have Reznor gas units now.
Spot cooling - this depends on building size and how many machines and machinists.
HEAVY filtration per previous posts. That air can get nasty. Also filters that are very easily replaced. Air handlers on ground level.
Get a contractor that can provide examples of past light commercial work in oil contaminated environments.
There are some cool chilled water systems that support multiple evaporator coil units.
Good luck.
"If we don't protect freedom of speech, how can we quickly find the assholes?"