<<By the way this o-ring is tricky to change (assuming your van is like
my 2.1 was). You need to remove the coolant lines to get the oil cooler
off, I used needle nose vice grips with hose on the metal jaws to pinch
the coolant lines so the coolant did not drain out, then removed the
oile cooler to get at the o-ring>>.

Not if you also unscrew the pipe adapter prior to dropping the cooler.
Then you don't have to go through any of the above and it's a simple
job.