i own a 3 pot engine car, also own a 11 years old proton saga
apart from reliability issue...there are 2 problems that are common with 3 pot engine that doesn't happen with 4 inline
1. vibration, 3 pot is naturally imbalance..so it will vibrate...whether or not the vibration reaches the interior...that will depends what mounting they use
expensive of course can suppress the vibration(it will align with the price of the car)
2. belting noise.....if u pay attention to cars around...almost all car that has chit chit chit noise when the car is started is a 3 pot engine car
can't be fix, can only be made temporarily disappear
these problem don't exist on a 4 inline
so after owning my current 3 pot engine car, next car is definitely proton
the release of so much 3 pot engine car made my decision even more convincing
but 3 pot is the trend , to comply the latest more tough Euro specification that emphasis on fuel intake and emmission many are going to 3 pot , the X50 is one of it soon or later sure entry level car all 3 pot aldy.