Depend's on why it's locked up. Pouring something into the motor will not do anything for something damaged by heat or no oil. I use to do a lot on machine work on these engine's, it seems like they were bad about spinning rod bearing.
All equipment is wore out.
<- Never mind. All equipment has been repainted and with new decals. It's like I have new mower's again!
48" Ferris WB
36" Ferris WB
All Echo hand helds
<- That's how I feel at the end of the day.