I quite like the sound of a 3cyl, nicer than a 4 for sure anyway.
I have a habit of skipping 3rd in mine on occasion because it sounds like a straight 6 if you use your imagination.

I quite like the sound of a 3cyl, nicer than a 4 for sure anyway.

Probably because they are rubbish, nothing to do with the fact it has one less cylinder.

Is this true because people told my sister that they do about 100,000 miles and then the engine fails?

They may very well blow up at 100k as the 3 pot engines are based on the 3 legged dog concept, not like the usual popular atkins cycle. 3 legged dog concept has its limitations.

My 3cyl has done 212k now. Still going strong.
Unfortunately, 3cyl engines have a few hindrances.
Often, they are bolted to a crappy rust bucket that will be worth so little that any minor engine issue would warrant a trip to the scrap yard.
Because they are usually small they need to be thrashed to get any sort of performance.
They are often found in the type off car that is driven by someone who doesn't see the value in regular servicing.
Of course. But the crap boxes bring down he reputation of 3cylinder engines.Often but not always, some retain their value quite well.
), rust
,soundtrack, 88 bhp/tonne, 56 mpg (over tank)
)Two examples I have driven :
Audi A2 - 100k on the clock, 2000rpm @70mph, no rust :-@ , 120 bhp/tonne, 70mpg best mpg (over tank)
Honda Beat - 60k on the clock, 9000rpm @70mph), rust
,soundtrack, 88 bhp/tonne, 56 mpg (over tank)
3 cyl's are the way forward - coming to a formula 1 circuit near you (next year maybe)
same plant as A8 builds

My car is 11 years old and has 120,000 miles on the clock. It has a 1.2L counterbalanced short-stroke tri-cylinder VW engine developed by Ricardo's in Shoreham.
No sign that it is going to fail any time soon. I'm sure that it will easily last another 120,000 miles, or another 11 years easily if I take good care of it.
I'm not sure where you would hear such rumours...![]()
developed by Ricardo's in Shoreham.
This means that some components in the engine are working more, for the same distance. Piston rings, bearings, valves and springs