New Porsche Cayenne Diesel

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A couple of months ago I test drove the New Cayenne Diesel (which I thought was fantastic). Speaking to the OPC they advised me the lead time was 6 months, which I wasn't to keen on, I have bought an ex demo from them previously and enquired about the Cayenne I had driven, only to be told, I would be able to buy it until March 2011, when they get a replacement.

Is the lead time for one of these actually 6 months? Are they holding back on production or just got too many orders?

Your thoughts would be appreciated...