Running costs


All the service parts are cheap as chips, it's only the 100hp specific parts that can be pricy. Shop 4 Parts carry or can source most of the things you will ever need for substantially less than the main agent and in most cases the parts they sell are OE. If you subscribe to Fiat Forum you save an extra 10% at the checkout too.
Servicing wise it's about £80 for an interim or £150 for a major, tyres are about £70 a corner for a Goodyear Eagle F1, front brake pads are around £60. Insurance is relatively cheap too. The only fly in the ointment is the relatively lofty tax banding of G (£185 a year).
If the cam belt hasn't been done get it done asap, the 100hp loves to be revved so you don't want to take any chance. Every 5 years is the manufacturers recommended interval. Budget around £170 - £200.