For Customs reasons my car (a 2008 Phaeton)was impounded for 5 years in a warm and humid garage in a tropical country, I am going to get it released soon, what kind of problems will I have to deal with in order to use it again?
Depends if fuel has been sitting in it for those five years... Too bad they
would not have someone start it up every month to keep the fuel from turning into
varnish, if fuel was left in it; and keep the engine and head oiled.
You could get lucky, dump some hi-octane fuel, and a treatment, and try and
start it... Can't loose, really...
If not, you will be replacing a LOT of fuel system components. Fuel tuns to a varnish
like substance when it sits too long, as it evaporates and leaves the more oily portion
of the fuel behind.
Engine oil: Change immediately, and see if there is a way to prime the
the engine before starting it up dry. There could be rust or corrosion
from being in a humid environment. Oil needs to be pumped through the
engine before starting it up, not sure how you would do that.
Check the belts for dry-rot, especially the timing belt.
A friend of mine had a pickup in a garage for over 10 years, OLDER pickup,
he put fuel in it, and he said it started right up, he got lucky...