How is the reliability of the N/A 1.2 unit? 1.2 puretech is wet belt and change interval has been cut to 6 years/60000 miles I believe. 1.0 is work of Toyota and I would go for this engine
The cheapest engine (badged 1.2 PureTech 130) is a 1.2 petrol with 129bhp. Reliability Survey but Peugeot as a brand finished in joint 22nd place (alongside Mercedes and Vauxhall) out of 30
So they look for avenues to extract the tiniest of efficiency gains from wherever they can and reliability be damned. The belt in oil has 30% less frictional losses than a timing chain system for a net 1% fuel efficiency gain. But they don't seem to be very reliable going by the information available on the internet.

01 April 2015. Peugeot has seen demand grow, year-on-year, for its ultra-efficient range of PureTech three-cylinder petrol engines since it was first launched with the new 208 and turbo-charged versions on the 308 from last year, which have seen a significant rise in sales by 252 per cent. Demand for PureTech three-cylinder petrol engines is up

Peugeot has announced a range of three-cylinder petrol engines to replace its 1.6-litre straight-four unit.. Named PureTech, the modular family includes naturally-aspirated and turbocharged 1.0
Peugeot 308 SW - Peugeot 308 1.2 Puretech. Timing belt broken.. Last week the timing belt on my 2016 Peugeot 308, 1.2 Puretech broke at start up and trashed the engine.
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is the 1.2 puretech engine reliable