V8 vs. V12

[Equus]

I'm looking potentially purchasing a post 2007 W221 S-class (or just possibly an equivalent CL class coupe) as my daily driver.

I've owned a 2007 S-class diesel, before, so I know the base car a little, but I'm interested in peoples' thoughts on the two engines. It would be a choice between the 517bhp V12 and the 525bhp 6.3 litre V12, so there doesn't seem to be much in it in terms of power output (both ample?).

And whilst it's not very PistonHeads, I know, I'm much more interested in refinement than performance or handling (hence I'm guessing that the V12 is my best bet, as a V12 ought to be inherently smoother?).

Is there anyone here who has experience of both engines, who could comment on the pros and cons, and what to look for?

[Equus]

Thanks.

I came to similar conclusions as your self, so I guess what I'm wondering is: if the V8 and V12 both have similar performance, economy and running costs, why do they both exist?

Unless there are distinct differences in their raison d'etre, why did Mercedes go to the expense and trouble of developing and marketing both engines?

[Equus]

JimmyR1 said:

Re my earlier claim that V8 and V12 models have broadly similar power (and economy) I should clarify that this applies when comparing say an AMG V8 with a non AMG V12.

Yes, noted, thanks: it's specifically the 517bhp non-AMG V12 vs. the 525bhp AMG V8 that I'm homing in on.

My focus is on comfort and refinement more than performance and handling, though I'm conscious that even the AMG S63 probably still ranks as quite refined, compared to the majority of cars. I do tend to agree with r129sl that the AMG styling is a bit on the lairy side, but it wouldn't necessarily put me off altogether, provided that refinement (and in particular, ride quality) isn't too drastically affected.

[Equus]

Dr mojo said:

Watch out for bills though. Mine in now 9 years old and back and forth to MB with niggles which are all expensive.

What sort of niggles, and what sort of annual running costs are you experiencing, our of interest?

My first experience of the S-class was not a happy one in terms of bills, but mainly down to one major issue with the engine that took a lot of diagnosis (and an eventual rebuild).

[Equus]

OK, thanks.

That doesn't sound too terrible, to be fair - a lot of the stuff (engine mounts, battery, vac pipes, coil pack) is components that I'd expect to need replacing every now and then on an older/high mileage car anyway. Guess the problem is that Mercedes parts prices make it smart a bit?

Wheels sound worrying - and another good reason to avoid the AMG!?