RPB

Is the overall demand higher for a 55 or 63? I can only assume the 63 is more reliable being naturally aspirated and later production. Something tells me the 55 is more sought after though for tuning purposes.

I’m not sure of the production numbers, but considering all things are equal.

Cheers.

Chest Rockwell

Values for both are dropping. I bought my 2006 E55 because of the low mileage and affordable tuning options. The M113 is a well-designed and proven engine, paired with the slow but robust 722.6 trans. The M156 had initial teething issues but have their own loyal fans. Just my .02 on the matter.

RPB

Interesting, I was not aware the 722.6 carried over.

E55amg0220

I think they both have their goods and bads, the E55 has a very strong proven motor and honestly not many have found the limits it may not have forged pistons but look at eurocharged stock motor, stock trans, stock blower and running 9.7 quarter at 140+mph all this on a motor with 160k these engines shine.

The trans may not be fast but its strong and in a world where it may mean the difference of a few tenths of a second to shift faster ill take a trans that can take a severe beating over a fsster shifting trans.

As for tuning ..... E55 all the way it has more options

Looks wise they very similar so i think thats comparable but the E63 is an amazing machine of its own the engine has had a few hiccups but i think people have made it out to be bigger than it really is with the headbolts, cams, and lifters. The trans is a great piece very fast and more gears as well havent heard of many problems with it.

I may be partial but i loooooove my E55 ive driven my buddies E63 an i loved alot about it but theres no getting over that massive torque of the charged 5.5 V8

equitiesguy

The M113 with the 722.643 is one of the best engine designs since BMW released their M73 V12 design for the E31 (850i/ci) which was the mating of their bulletproof straight six engine into a V12 (running dual everything, including DMEs). I don't know why Chris would refer to the 722.643 as slow. It's a bulletproof transmission Mercedes used across the board on all their high torque applications, including the SL65 (and every other corresponding V12 model). The only drive train I've personally found to replace my CLS55 with in all this time is the F140C which I'm driving now (still have the 55).

The 63 design, on the other hand, is nothing but plagued with problems to the point where owners actually filed a class action lawsuit over it. Whether the legal action went anywhere or not is irrelevant --- it's clear that that entire drive train had problems. Those problems were exacerbated by the 7 speed transmission they paired it to --- which has significant problems of its own. There's plenty of threads on this forum to do a little digging of your own if you want to know the specifics, or just PM me and I'll ruin your morning.

Stay away from the E63/CLS63.

tw2

I agree with the 5 speed being a slow transmission with a mind of its own but it is very strong. Newer cars shift a lot faster and seem to have better programming. The M156 cars are awesome, look good, sound fantastic, shift faster but the 55 is a faster car overall and the newer biturbo 63's are also faster and more reliable. From a performance and reliability point of view the N/A 63 is not the best generation. 55's are generally not too bad to fix in terms of cost and difficulty, 63's can be a lot more expensive if you are unlucky enough.

equitiesguy

If you think the 5 speed is slow and has a programming issue, it's because you failed to properly maintain it.

Solo wing

The M156 has its own share of issues ( head bolts, cams, adjusters, tappets....). With that said, I will still take it over the M113k. IMO, the E63 looks better, has the 7-G transmission, and is a lovely car overall. The sound alone is worth it.

Yuille36

The E63 has the 722.9 (7 speed) transmission, which is different from the E55 which has the 722.6 (5 Speed) transmission.

mondo

personally, i have no idea as i am not very mechanically minded, but a motor mechanic i met through a mutual friend who was familiar with (and had worked on) both cars advised me to go with the 55 for reliability issues.

Yuille36

I've owned three AMG's with the M156 engine, and I for one love it. The E55 is a beast, and I love that car as well. It's drive train is pretty bulletproof. Both cars have had it's issues, but the M156 has seen more, due to its complexity over the M113K. But the issues with the head bolts isn't universal, not all of the engines suffered from it. None of my cars has had any of these issues. But the choice if yours. If anything goes wrong with either engine it's going to cost you money period. It's an AMG "All Money Gone" But I will say this, I would trade my E63, and I wouldn't trade an E55 if I had one.

hachiroku

the E55 is a more reliable car and responds better to modifications due to forced induction. the E63 has a more aggressive look and stock has a better exhaust note. if planning to jump into a E55, plan on a 2005-2006 model, or an earlier one that has been meticulously maintained.

takeiteasy

that mechanic friend gave you good advice, i was in the same dilemma and tons of research and found the 6.3 to be well to put it kindly weak. 55 will beat the 63 in every way you test it. so why pay more for less. the 63 scores on conventional braking system i must say

tw2

I didn't know you had a copy of my maintenance records. My car just hit 30,000 miles. I did the last fluid, filter, pilot bush change at 22,000 miles, all oem parts. What more do you want me to do to it?

This is my 3rd 722.6 AMG, they are all the same. It is a great transmission and I love the car but I am not blind to it's downsides. I don't seem to be the only one either.

Pmarino

I'm a M112 / M113 fanboy Paired with 722.6 and maintained properly is a no brainer. Now the CLK has the 722.9 it has been stout as well (hope I didn't just screw the pooch)

equitiesguy

I keep forgetting that this is really an E55 forum, and you guys are all stuck with the old transmission programming Lol. I would also wager that was the first fluid/filter change done on the transmission in ... how many years of the cars existence? Based on the way you replaced your intercooler pump in the DIY in your link, you could have any number of issues connected with the way you "changed the fluid and filter" on your transmission and the subsequent way it operates "slowly" when the 722.643 is anything but.

E55amg0220

Sorry brother if u think the 722.6 is quick shifting then u havent experienced a fast shifting trans. Ive been a ASE certified mechanic for 25+ years an while extremely strong the 722.6 shifts slowly an has a mind of its own. Even when driven aggressively as i drive it still doesnt learn to downshift fast or upshift fast even when using the manual mode. I have a brand new amg mb trans done on extended warranty by mb and its got all new fluids, solenoids, and valvebody and no better than my higher mileage one was. I also have the tcu tuned which doesnt help, i was told getting a new modified valvebody is the way to go. I just took a 09 E63 for a drive few weeks ago an it shifts easily twice as fast has better part throttle downshifting abilities. Then drove a c43 amg as well an it shifts like lightning i wish my E55 shifted even close to these other transmissions but not at the expense of the strength.

N_Rob

I don't mean to be a dick but... I know you're not coming in here trying to say the 722.6 is a quick shifting trans . Nobody is disagreeing that it's a good, strong trans. As you stated MB used it in the V12 cars that have enormous amounts of torque and it can take a lot of abuse. But the 722.9 is quicker, then from there you start getting into new ZF boxes and dual clutches... just no. Hop in your CLS, do a WOT run through a few gears, then go on YouTube and find a pdk gt3/rs acceleration video and you'll see a quick transmission.

equitiesguy

Yea what would I know about fast shifting transmissions ... my other car only shifts in 100ms.

Saying you’re an ASE technician is basically laying claim to being a grease monkey. You don’t know the first thing about car design.

E55amg0220

Well and u dont know ur head from your *** claiming the 722.6 is a fast shifting trans so there ya go. As rob says this is a fast shifting trans

E55amg0220

Compared with this

E55amg0220

Or how bout this e63 hummmmm this grease mknkey sees a HUGE difference

E55amg0220

Or even the 722.9 much faster

E55amg0220

Another e55 sorry their all the same

E55amg0220

How bout the 722.6 in the s65 amg v12 .... its got to.be faster cus no lowly grease monkey could be right .... wait nope.its slow too