Weston -

I run a similar cooler setup we sell on my 80 Vanagon.  Myself, I mounted the
cooler up front behind the air grille to really catch the cool air.  Ran
copper lines about 2/3 the way back to the engine (where I mounted the oil
filter just head of the rear left tire), then hoses from there to the engine.
 Some list members mentioned a possibility of a loss in oil pressure, but it
was insignificant in my case, ran just fine.  I've run similar systems on
other Bugs and Buses I own (and have owned) with little or no problem -
usually mounted them to the front axle beam assembly used on these years
(thru 79).

A popular location is near the transmission, mounted at an angle to catch the
air flow, but I've always resisted that because of possible "road heat" being
caught up into it.

Jim / BusBoys@aol.com