OSHA's not really there to help you. It's there to enforce rules. If you do call them and don't want to hurt your coworkers, let them know so they can wear their steel toes, hard hats, gloves, etc. because they will get fined too. And you're taking the chance they'll shut down the shop for a variety of violations.

My suggestion is to first talk to your foreman/boss/whatever and let them know you object to the diesel running all day. Tell your coworkers how bad the fumes are for them. And I would bundle up and demand the doors are opened all the way with a fan running to blow out the fumes.

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1984 300TD