[Perfectlap]

Honestly, unless you live in the North Pole, you should try and take the car out for an hour drive every few weeks at least. These engines need to stay lubricated and that happens best when they are under load. If you have a somewhat heated garage where the engine can start up at a relatively warm temp (to reduce wear) it's a no brainer.
Obviously best to pick a day when the Sun is out and the roads are good.

But yeah keeping your an engine stewing in used oil for months is asking for double trouble.

80K car? Are you on the original water pump? Have you at least replaced the coolant cap? (especially if the coolant was flushed). Did the inspection of your 2.5 prior to purchase you include a compression and leak down test?