having a look at this months volks world mag... good article on getting more cooling from your oil cooler. the thing is, how hard is it to get a type 4 oil cooler?
Not too hard, I've got two 
Try dropping down to your local wreckers. They shouldn't cost too much (they don't look very impressive) but they are a pain to get out, you
have to remove a few things before you can get to them. You might be able to buy one from a VW specialist out of a broken motor.
broken motor ? just watch out for broken motor bits in cooler !
Would be best to get a cooler off a motor that is already running , if poss.
:thumbThanks guys
I was hoping id get those responses and not "your
dreaming!"

I was of the general impression that type 4's and type 4 bits were hard to get? perhaps i am thorougly mistaken
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I've done the type 4 oil cooler trick before & so has my father, & for the hassle it's not worth the effort. The temp guage
didn't change & the shroud ends up hard up against the fire wall.
After all the effort a simple external cooler is the only way to go.
regards
Jak