I have had my 1.6 16v 2012 bought with 6700 miles about two months now, having sold a Doblo Cargo 2007 after five years of really good service.
The sales blurb said the new Euro 5 engine promised 40% torque increase, great I thought! To be honest, although the new engine is silky smooth with a 6 speed box it is really flat below 1700 rpm, negating most of the new gearbox potential which is a big disappointment.
I then tried Shell V power fuel, (having bought it for my Cargo to cut smoking down) & what a difference that makes! The car now seems happy to trundle along at low revs pulling sweetly. Although the car was very low mileage when I bought it, I have travelled 3k in 2 months, so I don't think there were any "gummed up" issues. Hope this post may help other buyers?