Looking for a used Civic (06-09ish). I read they had big problems with cracked motors? At this point, would it have happened already and I am pretty safe to buy a used Civic? Are there certain big (besides oil changes, tire rotations, etc) maintenance things that should have been done at some point that I should ask the seller if they have done? I will try and take someone with me when looking but I am finding used cars go quickly and I may need to jump on one at some point. Any other input you have on Civics will help me out!