I had a new LS6 installed in my 2000FRC and have been breaking it in. Been varying the speeds for the first 500 miles. The first 250 miles have been on the freeway / city. On the freeway I never took it out of 5th gear and never exceeded 65MPH. It did burn some oil in the process. Have I hurt the engine by doing that? The last 250 miles has been on the freeway in 6th gear varying the speeds and never exceeed 65MPH. Flame suit on.