Stan,
        I have an oil coller installed over the tranny, but I have not hooked it
up (long story)  One of the reasons is that I can't seem to find an
acceptable way that I can run the rubber lines from a sandwhich adaptor
to the oil cooler.  Due to the tight space on the Type 4 air cooled
motor, it looks like you are foced to route the hoses under the motor for
a while .

The optimum way, which is sometimes done Type 1's (don;t know if you can
easily do on type 4's, i.e a kit) is to remove the stock oil cooler and
run lines inside the engine compartment then out to the remote  cooler.
This would get that hot oil cooler out of the cooling air and away from
the #3 cylinder, hopefully also minimizing the dreaded #3 valve seat
drop!

John R