m157 vs m156 longevity?
I live by the philosophy that less is (almost) always better. From an engineering standpoint the less moving parts there are, the less likely something, or part, will malfunction. The only real dread with the M156 engine is the headbolts, but that's only in the older models, and are a pretty rare occurence even then.
As for longevity and reliability, Weistec has one with 850hp (might still be for sale) that has seen its fair share of burnouts, racing, abuse, etc and is still fine. Now that is a monster under extreme exposure. A more tame E (even with a tune/downpipes which makes serious power) will be even more reliable.
I think it comes down to what you really want out of the car. I've had a C63 and find myself longing for an E63 at some point in time. The new E63S is just amazing and I want one in my life.
Honestly, the pro's to the C is cheaper, lighter, louder (pro for me at least), and looks great still. The E, more expensive, heavier, but just the potential of that platform to be an ultimate sleeper is insane. For reference, that weistec e can chase down stage 3 c63's, just ask JRcart. And it has massaging seats!
I also think the prefacelift c63 looks better than the facelift. Just a little more aggressive in my opinion but then you have to live with the fear of headbolts that almost never fail but can.
Drive both, consult your wallet, then decide. Both cars (in fact, all cars all makes all models ever) have their "issues" so ruling one out because a fuel pump might stop working is ridiculous. Besides, it will likely get replaced under warranty if you buy new anyway.
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OP - If you want a 4 door DD the E63S is hard to beat, and the Wagon is sweet. If it's a play car there are still 2015 C204 C63 coupes being built. I wouldn't worry about the longevity of either engine.
TT 5.5 can make big power and just eat things up in hw pulls but from the light might not be as much of a thrill as the 4.0TT. Still a thrill, just not as much.
The NA 6.2 Is just going to be that classic, loud, decently fast engine. That will be for the die hard purist but eventually die off to newer technology.
Last edited by stevel8206; May 6, 2014 at 08:25 PM.
OP - If you want a 4 door DD the E63S is hard to beat, and the Wagon is sweet. If it's a play car there are still 2015 C204 C63 coupes being built. I wouldn't worry about the longevity of either engine.
OP - If you want reliability, I would stick with the M156 motor. All the kinks have been worked out with this outgoing last of the large displacement N/A motor.
Last edited by I am Jeff; May 7, 2014 at 01:38 PM.
You made an overly broad statement about 500hp being enough, and I called you out on that statement. Just because something enough for you, might not be enough for everyone else.

You made an overly broad statement about 500hp being enough, and I called you out on that statement. Just because something enough for you, might not be enough for everyone else.
If longevity is really a factor and you are scared, why not just get extended warranty?(it covers the motor) That's what I did.







