I have to thank Mgarrison for making me think about this in his response to something I wrote in another thread. I had my lifters and cylinder head replaced this week. My question is, do I need to break in the new cylinder head gently or can I drive like I always do? If I do need to break the head in do you have any guidance on how I should do this? My car: 07' Z4 3.0i with sports package, 26000 miles on it. thanks!