I'm impressed with the 35 degree temp reduction.
my wild guess would have been more like 15 to 20 degrees...
35 F lower is a significant improvement.

----- Original Message -----
From: "Alistair Bell" <albell@SHAW.CA>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, October 06, 2010 6:27 PM
Subject: Re: Oil filter flange Coolant/Oil heat exchanger...works.

> geez Don, so the VW engineers were not just blowing smoke after all?
>
> :)
>
> Added benefit of the exchanger/cooler is faster oil warm up in cold
> weather.
>
> alistair
>
>
>
> On 6-Oct-10, at 5:58 PM, Don Hanson wrote:
>
>   Not long ago I queried the list about the oil filter-incorporated
> Oil/coolant  cooler that many VW seem to have.  My old 1.8 liter Jetta
> inline motor in my van did not have one but the replacment 2.0 liter
> motor I
> just installed did.  So I was curious as to whether they actually did
> anything...they looked pretty small to me and I figured the temperature
> difference between the coolant and the engine oil couldn't be so much
> that
> the 'cooler' would help.
>
>   Anyhow, I had mine running with out the plumbing going to that heat
> exchanger/cooler, whatever you might want to call em.  I didn't have any
> hoses or plumbing from my other motor and it ran fine without one
> so...But
> since this was a hybrid of two different motors, I decided I really
> wanted
> to KNOW how it was working, inside..so I installed a real (analog) oil
> pressure gauge and an oil temperature gauge..and I found my oil was
> getting
> too hot for my liking..Running it at 65mph on a 40 mile highway cruise
> showed the temperature of the oil stabilized at about 240f...and the oil
> pressure went down as the oil temp went up...15w 40w regular oil
> running in
> air temps of about 75-80f.
>
>   So I plumbed in the coolant lines to the top of the oil filter, the
> oil/coolant heat exchanger deal.  It brought my oil temp down by about
> 35degrees on the same highway drive, same temps outside, same
> speed...and my
> oil pressure stayed up better, since the oil was significantly
> cooler.  Now
> my  oil temp hovers at around 200-205f and my OP is around 30psi at
> 3000 rpm
> (60mph in my rig).
>
>   I was surprised.  So there you go...if you have an old style
> without the
> oil/coolant filter mount and you want to cool down your internals,
> find one
> of the oil cooler filter mounts...they are the same (on my motor)
> fit..and
> bolt right on..
>
>   I will probably add a real oil cooler, too,  for further cooling
> on my
> motor...
>
>   Don Hanson