The new CLS is presumably based on the W212 underpinnings +electronic systems? They do make a 204 bhp 4 cylinder diesel version but that would be a [ noisy?] mistake in a car like this.

The best engine for today's motoring would be the 265hp 620Nm torque V6 diesel.

However according to several reviews I have read its ESSENTIAL to specify the AirMATIC Dual Control air suspension option at about £1500 [ despite the long term reservations on possible repair costs] if you want the true Mercedes "waft factor" ride quality!
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grober, tks.
But from memory doing research on the net, thought I read avoid Air Suspension and Run Flat tyres, Air for long term maint/costs and tyres for ride quality ?
A big problem with Internet Research is getting an even/balanced view of items, I guess human nature could be to bleet more about bad items and less about good items, prob not the case on a site like this one, lots of very well informed people and very happy to share good and bad points.
A slight drift, but in the past when doing Internet Research on Peugeot 406 HDI's, many posts about clutch release bearing probs, yes, a few did have probs, but this engine/clutch/gearbox is used in hugh numbers and worried me in the start, but after more Research, I confirmed it was a rare issue.
Another slight drift, Swirl vanes on the BMW 3.0 D engines, as I was thinking of 525/530/535D before I could see little reason to get a bigger 5 than the 520 D (177BHP), appears these vanes cause big problems, very rare event, but event is very unplesent, a breakdown and big £ repairs, some people pay about £400 and have them removed to avoid the poss, in the case of these vanes, I don't know why anyone has not reported it to the DFT, when they confirm a known failing/condition exists that could be unsafe for driving (ie breakdown pulling out in front of a lorry for example) they will get BMW uk to fix/recall, I guess its just never been done. The reason I know is many moons ago, is, I reported an unsafe condition on a mororcycle, all UK sold models were recalled for a free fix.
Any pitt falls on the CLS320/350 cdi ???
Infact watt difference is between the CLS320/350 cdi ???
Cheers all....