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Which is the best DSG engine to have - the 1.0 TSI 115PS Petrol (3 cylinders, Torgue of 200, 0-62 in 10 secs) or the 1.6 TDI 95PS Diesel (4 cylinders, Torque of 250, 0-62 in 12.6 secs )? On paper the diesel has more torque but it takes an extra 2.6 seconds to go from nought to 62 and is lower in it's horsepower then the petrol. Any advice welcomed. Thanks!
 

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It is difficult to define the best, but here are some pointers.

The DSG gearbox was apparently updated in 2015 (to eliminate the earlier problems), and is currently rated at 250 for torque (will of course handle more, as there is a margin to avoid problems factored into the rating). The petrol engine therefore is less likely to stress the DSG.

Some versions of VW group cars have been critisied for a hesitation on pullaway. This only seems to affect the diesels, don't know if it affects the Arona diesel as have never tried it.

Apparently very few Arona are sold with diesel in UK (in some countries diesel is taxed about 20p per litre less than petrol) but in UK usually costs few pence more. The latest car sales figures (SMMT) show diesel at about 31%, petrol about twice at 61% (remainder are hybrids and electric). As diesels are often the only option on big cars, suggests most small cars are petrol.

Modern EuroVI diesels are fitted with DPF filters that clog up if too many short journeys, so are only really suitable for those doing at least 30 minute journeys (higher, say 40+ minutes in Winter) on regular basis to keep filters clear.

Diesels do save some fuel (once warmed up), but a quick check of real world mpg figures suggests difference is only few percent (need to be cautious as this may include manuals), more entries for identically engine Ibiza (but gearing might be different)

The current 1.6 diesel is quite an old design, unlike the 3 cylinder petrol. So will obviously not be quite as up to date.

The diesel has a shorter waiting time (guessing it is less popular so has shorter waiting list)

In my opinion, you need to be driving high mileages (on country roads) to choose the diesel DSG.
If just high mileage cruising at constant speed, then diesel, but why have a DSG as rarely changing gear
So unless looking at doing something like 20k+ miles per year would go for petrol.

My final thought is oil changes, modern engines like 1.0 tsi are relatively high stressed at 115bhp for 1 litre, so would be looking to change oil at around 12-14k miles max (regardless of what dealers (who have vested interest in car failing after few years, so can sell another, tell you). Don't think they will last if you stretch the oil changes.
 

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I will add the diesel is the newer EA288 Euro 6 from 2015, (upgraded to 6.2 for WLTP) and just added in 115 guise to the VW T-Roc. You now have the joy of Addblue which will need topping up around every 4000 miles at £10 a time and is located next to the fuel filler.

The diesel has a higher predicted GMFV and if buying new on PCP is 0% finance until October at present - so will work out cheaper than the petrol not withstanding usual better mpg. As always best to give both a try (if you can) and see which one you prefer.

Petrol feels more agile but the extra weight of the diesel gives a meatier feeling to the steering and the car feels slightly more planted on the road due to the extra front end weight. Not tried the DSG so cannot comment sadly...
 
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