That's what I use now. Pour it into stuck cylinders and bingo bango they free up pretty quick. Two pieces of advise: 1. Make sure you clean up all of the coke after. Otherwise, everything ends up sticky. Didn't realize that I'd splattered coke on my engine hoist, and a month later, I found out how sticky old coke can get. 2. Use 'fresh' coke, not flat coke.