回複：長期不開的車，多少時間開一次比較好？ 一個月？

The only concern is battery.  if you connect a battery maintainer to the battery, you can leave it for a year no problem assuming you are going for a long trip.  modern rubber/seals does not demand periodic oiling as old did.

when you come back after extended time, say one year, make sure change oil before driving.