I have a tencentlife external oil cooler on a 1991 Volkswagen Vanagon GL Campmobile with original 2.1, manual transmission, 179K miles.  Before the oil cooler, I had to let it rest when I drove at highway speeds and temperatures were at upper 90s or higher, to keep it from dropping oil pressure when I slowed to exit a freeway or similar (rpms below 2000, pressure would drop to 10-15 psi, idle would go below 5 psi and sometimes oil light would illuminate.  I don't have an oil temperature gauge.  After the external cooler, pressure still varies with speed, rpms, ambient temperature, and duration of driving at speed, but has never been below reasonable.  I suppose I should get an oil temperature gauge.

mcneely

---- Robert Clemmer <n51219@COMCAST.NET> wrote:
> I have a 91 2.1 WBX that just turned 300K miles on this past trip to FL.
> The oil pressure is fine until the oil temperatures start to go on the north
> side of 220 then it starts dropping proportionately with oil temperature.
> Oil temperature starts climbing proportionately with outside air temperature
> when the temperatures are above 85.  When it is 95 or higher outside my oil
> temps can go 240-250 and pressure will drop to 30 psi at 4000 rpm.
>
>
>
> Those of you have that have installed external oil coolers, how effective
> have they been?  What kind of temperature drop can I reasonably expect if I
> decide to install an external cooler when I pull this engine to "freshen it
> up"?
>
>
>
> Thanks for your comments, BobC

--
David McNeely