> If your engine compartment is a tightly closed area like Air Cooled
> versions you might have an explosion if the additives contain Butane or
> other highly combustible materials that have leaked out and not
> ventilated to the outside.

Air cooled engine compartments are sealed so that the cooling fan does not
suck the hot under-engine air, but breathes cooler outside air.  Hence, the
fan is constantly sucking air in from the top, the funky air vents on our
Vanagon, and spitting hot air out the bottom.  There's no seal and no time
for any gas to have time to accumulate.  Imagine trying to light your fart
in a stiff breeze, OK? ;-0

Chris S.
'85 Westy
www.knology.net/~vw/
http://groups.yahoo.com/group/wolfsburg_campers