Last month, I was going to change oil on my 2007 Chevy HHR.... It has a lot of miles on it... I have changed oil and worked on cars since 1968 so I am not a novice.... but I suspect that cars running for many more miles, I over time, that there are going to be more oil changes and the oil pan bolts have to be removed many more times thus the possibility of rounding them off.... and yes, it is my fault because I should have used a better wrench when removing it last time..... So... I adapted my brake bleeding tool with a long plastic hose to remove the oil through the filler tube. It worked, but is a pain...... So I got a new drain bolt and now need to remove the old rounded off bolt. I know there are other forums on this but I know what I am doing.... kind of... I borrowed the "rounded off removal socket set" from a friend and will use it and I am confident it will work... but I do have a question.... Is there possibly an advantage to heating the bolt before using the extraction socket on it? Also.... any other advice/suggestions are welcome and appreciated.....