Finally finished my flush 24 gallons later... Had dinner reservations yesterday and had to finish up today. All I did was remove the thermostat and keep flushing. Didn't mess with the block plugs since I couldn't find the driver side one and didn't feel like burning myself on my LT headers. Bit of advice, don't park on a slope with the front at the high end and the driver side slightly higher. After 18 gallons through, I parked in the garage and was able to get over a gallon and a half through vs. 1.25 or less parked on a slope. Just added the new 100% oat and went for a short drive. I noticed it's cooling much better. I still need to check for 50/50 and adjust accordingly.