A) Piston Rings

After it was finally admitted in late 2011 that there was a problem leading to engine failure(bearing in mind the engine came out in 2010), SEAT offered customers new piston rings.
Actually, what they were doing was fitting completely new pistons. It was VW trying to delude the customer that it was a minor piston ring batch problem rather than a major piston design problem.
In truth, its the pistons that were weak full stop and couldn't handle much punishment before they failed. The specific problem was that the part of the piston between the rings used to crack and then come away, damaging the piston rings and eating into the cylinder bores (although these have proven to be very strong due to being plasma coated).
There have been examples of totally standard cars having piston failure and these tend to be early cars with the original ignition hardware and OEM ECU software. Then when you add an ECU map you are bound to have a failure.
When these pistons crack, oil consumption is increased as it enters the combustion chamber, also lowering the effective octane value of the fuel being injected. This is not the only reason for oil consumption and equally the culprit is the turbocharger, especially on cars with aftermarket exhausts. I will talk about that later.
Its easy to blame the pistons but its not the whole story. If the car was used for daily driving and not running massive amounts of boost, there’s no reason why these pistons should be put under such an amount of punishment that it would result in failure........unless there are other contributing issues, which there are. Read on.........

Solution: Revised pistons 2012 onwards