can i use my milwaukee m18 drill to mix drywall mud or is that gonna burn it out?

You can, but you need to manage the load and heat. This drill has a thermal overload, but constant high-torque work like mixing mud will push it.

Here's how to do it safely:

1. Use a low gear setting (setting 1) for more torque.
2. Mix in short bursts. Don't run the drill continuously for minutes.
3. Stop and let the tool cool if the housing feels hot to the touch.
4. Keep the battery cool. The tool's operating range is 14°F to 120°F.

If that didn't work and it keeps shutting off, the mud might be too stiff. Pre-mix it a bit by hand first to reduce the initial load.

Heads up: Always use a side handle (accessory handle) for high-torque applications to maintain control and reduce strain on your wrist and the tool's internals.