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