http://oppositelock.kinja.com/carmax-warranty-for-the-m3-saved-my-wallet-1776735614
"BMW determined that the problem was a broken valve spring on cylinder number 6 and informed CarMax that it would be over 30 hours of labor to fix the issue"
"BMW determined that the problem was a broken valve spring on cylinder number 6 and informed CarMax that it would be over 30 hours of labor to fix the issue"