I have at least a couple cars that hibernate for about 6-7 months out of a year and they need minimal preparation beforehand. IMO, three weeks are easy, but if you feel something has to be done, do these 3 things:
- top off the fuel tanks
- connect a float charger (not trickle charger), leave the hood open
- inflate tires to about 5 psi above the recommended pressures
I don't add any fuel stabilizer and I leave the car parked for the duration without starting or warming up.
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