That's sure, the car is lovely. I didn't know the necessary of a oil cooler for this engine, beside the necessary of an improvement on the water cooler with electric fan or so, gives the engine hot fame.
Can't see the pipe routing but I'd go for an extra matrix piggy-backed onto the heater for extra cooling. I remember that someone in the UK did this using a Vauxhall Astra heater matrix. Car is in Spain I think and is black, not a very "cool" combination. Nice car and not overpriced considering that it has been covered up in a showroom since having a full rebuild in 2000. Ad quotes it as "Condition 2" but looks better than that to me.