Melnor65165AMZ XT Turbo Oscillating Sprinkler

Q: What is the gallon per minute output?

The number of gallons of output will be directly tied to the number of gallons in your water flow.

Q: Any tips for what to do if not oscillating? Does this mean it's broken/garbage or is there a way to repair the sprinkler?

Sara, The only thing I can think of that might impact this oscillation is lack of water pressure and this might include dirt/debris in the water connection filter of the sprinkler. If your hose has good pressure and there is no debris, you might try spraying the moving joints with a bit of silicone.

Q: can you buy spare parts

If you are referring to the hose and sprinkler quick connects, yes. As far as parts for the sprinkler itself -I don't know. The sprinklers are very rugged and we've not had the need for any sprinkler 'parts'.