Hi Guys,

I tried searching the internet but was unsuccessful. Would any of you know of any case studies of long term high mileage engines and their respective measurements? Mainly curious to know the wear characteristics and if Nanoslide bores wear at all like steel liners do. If they do wear, what characteristics are attributed with what type of usage. Can an engine be rebuilt and go 2 million miles with the original Nanoslide coating, etc.

Thanks,
Barry

 

I’ve seen a couple m156 apart with around 110-120,000 miles and the bores were really nice with a almost no wear differential from cylinder to cylinder. Actually the pistons and rings where all pretty nice in those as well which may be from the reduced friction from the coating

 

Bore wear is pretty much a thing of the past even on stock engines with current modern oil technology. I've had many engine apart even with stock steel liners with 150,000 miles plus with no measurable excess wear. My own DD has 165,000 miles on and when I took the sump pan off last years I could still see the cross hatch marks on the bores from honing!!

 

Friends car hasn’t been opened up but his 2010 C63 has 220K miles. Tune, bolt ons, and beat on heavily. Only major ish repair has been lifters. Other than that routine maintenance and still runs like a low mile one.

 

Bore scuffing is alive and well on the M157/M278 engines which succeeded M156.

Not many scuffing or bore issues are reported on this site for the M156.

A growing number of scuffing cases are reported on the M157/M278. The search feature on this site will provide the information.

 

Yep I’ve seen some issues on the m157 in this regard. It’s a different cylinder coating and definitely not as durable as the one used in the m156

 

real amg motor versus modified regular mercedes engine. M156 / m159 are in their own league. m278 to m157 is like m113 to m113k or m176 to m177.
All of them can have scuffing on cylinder walls. It all depends on maintenance, tuning, fuel quality etc... Some people see their car overheat and just keep driving, others drive with check engine lights on for months, others go on spark plugs until a misfire. So many variables and so much neglect.

 

You can see it within this video. This guy seems to build AMG engines. at the 11:30 mark in the video he talks about the durability of the coating on the high mileage engine.

 

if an M156 were to have low compression in a manual compression test, would this be then attributed to the rings wearing if bores with Nanoslide are super hard?

 

I have this question as well, is it just new rings and go?

It also appears that as others have stated, not all uses of this tech are the same, for instance the Gen III coyote cylinder wall scoring drama. I wonder if PFL cars and FL have varying degrees of hardness. The only High mileage M156s I see are the 07 E63s and PFL C63s and the occasional CLS (not saying they don’t exist just that I haven’t seen any for sale).

and isnt the M157 issue soft Conrods and the M278 issue cylinder 5 valve failure? I didn’t think they had any issues with the walls themselves but rather everything else. After readying several M278 threads I don’t think I would ever buy one of those.

 

I don’t think the wearing is that common per say but it does happen. As you stated for some reason it’s usually the number 5 cylinder first to show signs of wear.

 

hard to say for sure but yes that would be my guess if you have ruled out any valve seating or head gasket issues

 

First path of diagnostics for me would be failed head gasket. M156 has well known head bolt issues so head gasket is a candidate before others. Failed rings are rare on untuned engines.

 

Actually an interesting anecdotal note. With HPTuners I’ve noticed prolonged cranking at startup at least one or two seconds longer only on a specific fuel tune I was working on.

It felt like the extra fuel would act as a degreaser clearing out the block of essential oil that would otherwise act as a sealing agent for compression. I ended up backing off tuning significantly after this.