Hoepfully for the last time

My 550 S4 is going into the dealer again, hopefully for the last time. They are putting on a new bed, and replacing a head gasket. It's been back firing a lot. Still runs okay so they are replacing it just to be sure. Head gaskets are a know problem with most all the 2011/2012 models. Just in case you didn't know the John Deere Dealer said they replacing Head Gaskets FREE up to 500 Hours regardless of warrentee. I thought that was great of JD to step up to the plate and take responsiblity. Also they are going to adjust the linkage for the 4 wheel drive. It will not completely engage unless you put it all the way down to locking diferencial. Works great when it's in Locking Diferencial otherwise it jumps in and out of 4WD.