Caporegime
When I was on Stobart's, work got quiet in the new year so a fair few tractors got parked up, lease payments suspended/reduced due to pay by mile system etc, most were back in service by late April / May having stood since just after the new year slump, never had a problem with any of the "off lease" as we termed them at our depot. - a mix of 12.8 - 13.6 engines.One of my workmates left his car while he was abroad and it started fine after a full 3 months sitting idle. It is only a 1.0 though, so your mileage may vary.
All relatively new vehicles which ran pretty much 24/7 (day & night shift trucks) , on the other hand, when I used to sleep in the cab overnight, if I didn't fast idle the engine for 10 minutes prior to going to bed (having used a microwave for tea & then watched a film on an inverter powered laptop) it wouldn't start in the morning.....