The 2004 Volkswagen Passat runs on premium unleaded (recommended).
Use your key to unlock the door.
Yes, use a relay to power them as you will burn out switches if you don't
how to use the 2001 passat jack
I have a 04 passat glx and I use 89 because the car will throw an error code if you use 87. i don't have any issues with 89 and the car runs great on it......
When you go to buy a battery they can tell you the correct size.
Depends on the size of the engine in the boat.
Most use a small 12 volt battery.
The fuse you use is determined by the load on the circuit and the size wiring used in that circuit not the battery voltage.
I would use Mobil 1 synthetic 5w40. It seems to work the best for me.
http://shakti.trincoll.edu/~sritchie/Passat_fuse_panel.html This should answer all of your questions about the fuses, what they are for and what amprages to use.
They use a 1/3N 3 volt battery. AimPoint models which do not use AA batteries also use the same battery.