Ok, I ordered new 4.6l from a 2000 mustang with 54,000 miles on it, for my 97, whos old engine crapped out. After 2 weeks, they finally finished installing it saturday! My question is, the mechanic said not to allow the revs to go above 2 1/2 rpms for the first 1,000 miles, and I want to know if this seems normal or rather long to y'all? I had a friend who had to get her engine replaced in her 4cy 99 saturn, and they told her just not to exced 50 miles per hr, for the first 500 miles. I have a 1 year/12,000 mile warenty on it, and I'm thinking that he might have extened the break in time to cover his ass. So anyone who has any experince with this that could help me out would be greatly appreciated.