AMG6.3

2010 84,000 miles on stock head bolts

Jasonoff

This one has almost 226K km.

Fhast

Recently at a car show I seen one with 240k miles

NickAMG

I'm currently at 156k miles. Runs very strong, full bolt ons. I also am on top of the maintenance, oil changes every 5k miles. No issues whatsoever.

C55_AZ

2009, 129k on stock headbolts.

My dad has an 09 with 130k, Renntech R2 package, stock headbolts

bhamg

At 0.18 he says "2nd engine."

JarredAMG

‘12 got 90,000km (56k miles)

agp423

13 with 60k miles, no issues so far besides the standard stuff like tires, wheels, and alignment.

AMG__POWER

I’m starting to think not all 08,09,10 m156’s are burdened with bad headbolts! Mine has 154k on it, a 2009, perfect maintenance, oil changed every 5k stock headbolts, and I make 485whp

AMG__POWER

where do you guys buy extended warranty for cars With 100k+?

Jasonoff

The metallurgy composition is not consistent as you will see some extracted bolts are worse that others. Sure, it's possible you can have 20 "decent" bolts that could take much longer to fail.

AMG__POWER

true, my SA and technician at mercedes said some people did get lucky and never experienced headbolts issues, as they said the car got a really bad wrap ( good reason as to why imo ) but not all The headbolts where Faulty

hachiroku

not a C63 but i have 152k hard miles. buckets and head bolts updated. cam adjusters probably need replacement in the near future if they haven't already by previous owner. would have to review service records to determine that.

Jasonoff

Yet... haven't experienced it yet.

The metal will corrode eventually being in the water jacket.

AMG__POWER

yep, hopefully it stays this way, I got a quote for 1800 to change the headbolts in SoCal, if anyone knows a shop that Offers a better price please share!

Yuille36

One of the reasons, why some have experienced failed head bolts is because they never change their engine coolant. I’ve owned three AMG’s with the M156 engine, and never had any issues with failed head bolts. I’ve also changed my engine coolant on an accelerated interval. I did finally change out my head bolts on my E63, not due to failure but as preventative maintenance. And after having them done and examining the bucket lifters and head bolts, they were in excellent shape considering their mileage and age. In hindsight knowing what, I know now, I wouldn’t have had them done unless I experienced some issues.

hachiroku

do you really want to shop around for the lowest price...honestly bro, really? got a shop well known for doing the job right.

ZephyrAMG

Seriously. You just bought a car that was $65k+ new, you got it used with thousands off, you just got into the car after the car has been out 10+ years... Don’t be a cheap college kid... get the car done somewhere with experience and knowledge using the best techs and tools. Don’t be that guy that has 23 air freshener trees hanging from your rear view mirror and homemade fender flares...

Jasonoff

It's 4x more to fix it after the fact with the risk of irreversible bearing damage.

I did mine myself for ~500 in parts.

AMG__POWER

it is a reputable shop, thank you for your concern, he’s actually a very influential member on this forum!

AMG__POWER

this! I feel like a lot of people don’t actually swap there coolant rather just top up

hachiroku

i would change my coolant every year prior to doing the head bolt job after gaining ownership of my vehicle.

Vladds

At what mileage did you change the coolant?
Did you dilute with distilled water ?
Did you actually first drain all coolant out of radiator and block?

Yuille36

I don’t go by mileage, every two years the coolant is changed. Yes, I used distilled water, and The petcock is opened to drain the radiator. Then suction is used to siphon all remaining coolant out before new coolant is pulled into the system. Then the engine is brought up to temperature, and the reservoir is topped off if needed. Once my old head bolts came out, they were in decent shape. But I was already committed to replacing them. But if I had to do it all over again, I wouldn’t unless I had a issue.
But the choice is yours 🤔

Vladds

Were you the first owner on this particular car?