Auto Express's reliability ratings are based on our Driver Power survey of over 30,000 car owners. Ratings are the average for all owners of this car who responded. Individual owners’ ratings and comments appear below.
07-reg Petrol, Owner for 1 to 3 years

The CLS 500 is brilliant; makes every trip an occassion! Mercedes are superb cars however their dealer network is poor and the servicing departments even worse. Previously I had an S500 and they managed to put an 8" gauge down the bonnet (to bare metal) when they were giving it the first service. Also had problems with salesmen not being prepared to discuss a test drive in an E55 with me because I looked scruffy - a week later I turned up in a demo model that I had bought elsewhere!

Reliability: 5/5 Build Quality: 4/5
56-reg Diesel, Owner for Less than a year

Apart from the diesel glowplug problem (all 6 eventually replaced free even though they are "wear & tear items"), this car is so much better-built than the 2003 E-320 CDI it replaced. The steering is so sharp & accurate with great feel. The clincher though is that fantastic Michael Fink design which gets looks all day long & makes you happy to be piloting such a timeless beauty.

Reliability: 4/5 Build Quality: 5/5
58-reg Diesel, Owner for 1 to 3 years

This is my Fourth Mercedes and it certainly is the best I have ever owned.After sales service is exceptionally good.The main dealer cannot do enough for me and I am most impressed.So much so that I have a real brand loyalty now that I hadn't before.

Reliability: 5/5 Build Quality: 5/5
2008-reg Diesel, Owner for 1 to 3 years

Only problem has been with air con, which was repaired, at a cost with contribution from manufacturer - out of warranty. I have taken advantage of a service plan which reduces the servicing costs slightly.

Reliability: 5/5 Build Quality: 5/5
2011-reg Diesel, Owner for 1 to 3 years

Had a vibration from engine for the last six months since a problem with gear box that mercedes can not diagnose. Quite impressed to be honest for such a big car and engine.

Reliability: 4/5 Build Quality: 4/5
06-reg Petrol, Owner for 1 to 3 years

Lots of rattles, one of which is recurrent (already fixed 3 times). Auto box had to be replaced under warranty after much aggravation with Mercedes

Reliability: 1/5 Build Quality: 1/5
06-reg Diesel, Owner for 1 to 3 years

The car has surprising character for a car in thsi class. Not perfect but enjoyable to drive and own

Reliability: 3/5 Build Quality: 4/5
2012-reg Diesel, Owner for less than a year

It's new so very reliable. It's worth spending the extra on quality.

Reliability: 5/5 Build Quality: 5/5
2006-reg Diesel, Owner for 1 to 3 years

Completely reliable

Reliability: 5/5 Build Quality: 5/5