Before you by your Renault take the plastic engine cover off and inspect for any oil weeping or residue around the rocker cover bolts or Ignition coils.
The vehicle may be mechanically fine with this minor oil weeping, but this will cause oil to cook off and an oily coal smell to enter the cabin.
This may be caused by the rocker cover seal failing. To fix this problem will either require the rocker cover being redone which will require all the belts to also be replaced.
Or a shorter term fix by resealing the bolts individually. I purchase a mechanically sound 265 trophy+ with 37 km on the clock only to discover this annoying issue.
Although I love the car It took some time to figure out first what the problem was exactly and also how to solve it.
Also check how much disc is left on the brakes, before you buy and take that into consideration as you may buy a car which will require new discs in a few months.
Note if your A/C is unusually noisy might mean its on its way out, should that fail its a pain the arse to replace or an expensive trip to the garage.