Stored my 2005 Jeep Liberty CRD diesel for 5 years (could afford to fix a major mechanical issue) . I filled the tank full with diesel, added a heavy dose of stabilizer, and diesel biocide, drained / flushed the cooling system, added brand new coolant (no water) , drained the oil , added brand new Redline synthetic , jacked up the Jeep, put it on Jack stands , so the tires wouldn’t flat spot.
Put the Odyssey AGM truck battery on a NOCO automatic (on/off) trickle charger.
I started it once a week for 5 years to get it hot and circulate the oil, coolant and keep the seals fresh. EDIT:, I also completely flushed the brakes/ fluid, and added brand new fluid. I pressed the brake pedal multiple times during the once a week start up .
Finally repaired the issue last year. Zero issues with storage that long.