Had a 306 (1.4 petrol) for ~20,000 miles and only needed consumables. Aircon didn’t work (vaguely remember it being something to do with the pipes begin low down at the front of the car so they corrode badly, a common fault), but apart from that everything else worked, even the electric heated/moving mirrors! It was comfy and drove nicely but the engine was gutless and slow – bought for the cheap insurance due to age. Was written off by my brother putting it through a hedge.
Now in a Citroën Xsara estate (not the Picasso), which is mechanically identical to a 306 just a lot uglier. It has the 2.0 Hdi with 110hp (not an option with the 306 – only has the 90hp without the intercooler). Drives very nicely, economically and can easily chuck bikes in the back. It’s on 170,000 now and hopefully will do over 200k. Cost £520 and most electrical things work.. Favourite fault is that the brake pedal also activates the rear wiper motor! But can’t complain for the price.