Re: Why did I buy a diesel ?
1) No HT ignition to go wrong
Just glow plugs, turbos, dpf and dual mass flywheels. Though turbos and dmf can also be found in some petrol cars. Coil on plug does have issues though so I understand if you have been bitten by that.
2) Better power per litre leads to phenomenal fuel economy. 44mpg for mixed use for a 1.6 engine would be impossible for a petrol
BHP/Litre? Not if you compare a diesel turbo to a petrol turbo. The economy is mainly down to the lack of throttle plates, lean burn and lower parasitic losses. Petrol economy was held back by not being able to implement lean burn due to cats in the early 90's. One of my cars (petrol) has a cat to deal with NOx so does have lean burn, does not need a urea tank either.
3) By necessity, diesel engines are stronger (force of compression). Stronger = more reliable.
As per other comments, they have to withstand higher forces. They are heavier and more expensive to produce.
They do have their plus points though and can be cheaper to run, especially if used for longer journeys and higher than average annual mileage.