stevel8206

I've owned a 2010 c63 in the past and recently just sold my cts-v. I'm in the market for either a new m157 e63 or new m156 c63. I plan on keeping either car I get for as long as I can. Which car will ultimately give me less problems in the long run? pros/cons between the two would be awesome.

roadtalontsi

157 is much more complicated of an engine. While they are doing just fine currently since they are still new. Long term wise these engines will become very costly. The Direct injection injectors, and high pressure pumps will eventually fail and cost and arm and a leg. The fact that the oil pump is variable is scary aswell. The motors are also a pain to work on. Add a tune and down pipes sure the power is crazy not to mention a big mpg improvement in general over a 156 but whether the engine and parts will hold up who knows? Since you're talking about keeping it i'd go m156 all the way. Old reliable and basic. Everyone knows the last revisions of an engine before the end of production are the best too. If your worried about power just get a supercharger and be done.

tfthach13

^ +1

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.

ab0bab0i

Wait for W205 with the new TT 4 liter.

stevel8206

Is the e63 518hp about even with a tuned c63?

CarHopper

Compare apples to apples. If you're going to compare cars do equal to both. A stock E63 would hang with a tune C63 though. Tune the E and it will get away from a C.

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.

PkB2014

I feel the same way. Love my C63, but that E63S just seems bonkers. I'll hopefully get to drive one at the Academy this weekend in Palm Beach and get a taste.

jvanbrecht

E63 Estate.... go buy one.. almost the ultimate wagon (I still think the RS6 Avante might be more of a monster)

rediesel

Between the NA 6.3L, the TT 5.5L, and the new TT 4.4L - that's your pick?


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.

CarHopper

The TT with smaller displacement/smaller turbo's is going to be a torque monster. Especially when it is tuned. It will also be lighter and just get off that line like a missile.

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.

TTA850

From a reliability standpoint I actually think the M157 will be the better choice, only because it is based on the M278 engine that's used in almost everything Mercedes makes where as the M156 was an AMG design used only in AMG vehicles. That said the M156 was designed with one purpose in mind, doing it exceptionally well and sounding incredible with headers - I'm planning to order a '15 E63 and fear I will miss the sound and throttle response of the M156 with headers hoping the increased power and AWD will help me forget…

stevel8206

Love all the responses, Please keep them coming. I will most likely not be tuning the e63 and it is the base model with 518hp. Who here has made the switch from c63 to e63?

ab0bab0i

Mostly because of the new W205 body. All of those motors already have enough power.

nkc

what of the upcoming s63 coupe? should be a beast

I am Jeff

Can you define "enough power" for me? "Enough" is highly subjective.

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.

I am Jeff

You can call me out and listen to mine when you miss your M156.

ab0bab0i

500hp/ 450tq should be enough.

I am Jeff

Enough to do what? A standard C350 with 300+ hp should be more than "enough" to get you to point A to point B. Like I have previously stated, the definition of "enough horsepower" is subjective.

ab0bab0i

And you are propping up the M156 only because of sound? Straight pipe any car and it will sound aggressive.

I am Jeff

Relax there...no need to get so defensive. It's a fact that turbo's will need replacing as the years go on. And yes, a N/A motor will always sound better than a turbo motor.

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.

rediesel

So on a thread about the longevity of m156 vs m157 you pick an off topic smaller less powerful engine and base that decision on the platform.

ab0bab0i

Turbos will produce more power.


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.

I am Jeff

It appears that staying on topic is quite hard for you, but try to read what the OP post before you comment next time. The OP asked about the reliability of M157 or M156. He didn't ask about which body style you liked more, whether or not it had "enough" power, turbos producing more power, or extended warranty.

ab0bab0i

You never know, thinking outside the box could change OP's opinion & give him other options on cars.

TTA850

I may just take you up on that