M156 head bolt problems


For the last couple of days my 2010 ML63 with 17K miles has been showing the top off coolant warning. Given all that's going on with the head bolt issue, I thought it prudent to take her in, plus I wanted it on record that I'm aware of the TSB. The local dealer did a complete diagnostic and of course all is well with the vehicle. There were numerous "CODE STORED" messages due to low voltage all over the vehicle. I'm assuming this was a result of the battery running down while it sat on a Dealer's lot for quite a while before I bought it.
She did show me (but wouldn't give me the document) what they would do related to labor to complete the TSB if needed. The process does of course require an R&R of the heads, 2 oil changes, and new "tappets" (no reference to cams).
Labor hours total 15, which is about $1,500 plus parts if out of warranty.
I've gotten mixed signals related to extended warranties, so while there, I also got what I hope is the straight story. As long as the vehicle is still in warranty the dealer will sell the MB EW. It does not matter who the original owner is/was, or if it was CPO or not. Many of you probably already know this, but there seems to be conflicting stories on the various forums.
My local Tucson dealer on the ML63 charges:
5yr., 75K = $2,609
5yr., 100K = 4,173
5yr., 125K = 5,013
6yr., 75K = 3,495
6yr., 100K = 5,139
6yr., 125K = 6,036
7yr., 75K = 4,024
7yr., 100K = 5,749
So, I'll decide what to do about the ML at some point, but will likely not extend on my C63, since I will not likely keep it long enough to go out of warranty.
Regards,
Joe
My local Tucson dealer on the ML63 charges:
5yr., 75K = $2,609
5yr., 100K = 4,173
5yr., 125K = 5,013
6yr., 75K = 3,495
6yr., 100K = 5,139
6yr., 125K = 6,036
7yr., 75K = 4,024
7yr., 100K = 5,749
So, I'll decide what to do about the ML at some point, but will likely not extend on my C63, since I will not likely keep it long enough to go out of warranty.
Regards,
Joe
Last edited by m a x i m u s; Jun 29, 2012 at 11:53 PM.
Last edited by DuaneC63; Jun 30, 2012 at 03:30 PM.
For the last couple of days my 2010 ML63 with 17K miles has been showing the top off coolant warning. Given all that's going on with the head bolt issue, I thought it prudent to take her in, plus I wanted it on record that I'm aware of the TSB. The local dealer did a complete diagnostic and of course all is well with the vehicle. There were numerous "CODE STORED" messages due to low voltage all over the vehicle. I'm assuming this was a result of the battery running down while it sat on a Dealer's lot for quite a while before I bought it.
She did show me (but wouldn't give me the document) what they would do related to labor to complete the TSB if needed. The process does of course require an R&R of the heads, 2 oil changes, and new "tappets" (no reference to cams).
Labor hours total 15, which is about $1,500 plus parts if out of warranty.
I've gotten mixed signals related to extended warranties, so while there, I also got what I hope is the straight story. As long as the vehicle is still in warranty the dealer will sell the MB EW. It does not matter who the original owner is/was, or if it was CPO or not. Many of you probably already know this, but there seems to be conflicting stories on the various forums.
My local Tucson dealer on the ML63 charges:
5yr., 75K = $2,609
5yr., 100K = 4,173
5yr., 125K = 5,013
6yr., 75K = 3,495
6yr., 100K = 5,139
6yr., 125K = 6,036
7yr., 75K = 4,024
7yr., 100K = 5,749
So, I'll decide what to do about the ML at some point, but will likely not extend on my C63, since I will not likely keep it long enough to go out of warranty.
Regards,
Joe
Glad you caught this in time. The lifters don't compress properly causing premature lifter wear. There doesn't seem to be an issue with the cams. Since you're going to get the head bolt issue covered under warranty, then any buyer should not be concern about this major issue. Depending on when you plan to sell, having a year left on your warranty gives the new buyer some piece of mind for all the other items that might go wrong. Of coure you can't wait to buy the extended warranty assuming prices don't go way up.
The Best of Mercedes & AMG
Even 2012?
And just so I can kind of grasp an idea of how big of an issue this is, could we compare this to the SMG issues on the e46M3? (As in number of vehicles affected)
No idea how prevalent it is. But given the amount of active members reporting in here, it is not too comforting. But hey, I've been accused of being a "Chicken Little" over this issue.


2012s are not affected.
Regards,
Joe










