well , if you want to 'get more oil pressure' by keeping the oil cooler..
a simple 'patch' cheater way is put in a cooler thermostat.

it doesn't really 'fix' anything ..
it just masks the real issue.

OP is primarily a function of oil viscosity ....oil temp, and bearing oil
clearance.

I don't especially believe in weak oil pumps....but some people get some
improvement with a new one..

heck..put in straight 50 W.

15psi hot at say 2,000 rpm is not 'that bad' ..
not that good either.
at idle rpm , hot .......that's pretty good.
many engines idle hot at 5psi even.

 I'd be pretty happy with 10psi at a hot idle generally..
as long as high rpm OP is say 35 or so.

and ..
with a high mileage 2.1 waterboxer engine you're on borrowed time anyway if
there's lowish oil pressure.

Scott
www.turbovans.com

----- Original Message -----
From: "Dave Mcneely" <mcneely4@COX.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, September 22, 2011 8:24 PM
Subject: Re: Low oil pressure - how to improve

> If running at high ambient temperatures, an external oil cooler might
> help.  It did for my camper, also a 2.1 engine.  mcneely
>
> ---- HotelWestfalia <zolo@FOXINTERNET.NET> wrote:
>> Hi to all,
>>
>> I see the pressure getting lower and lower as the engine warms up.  From
>> 60 to 15 psi.
>> The question is; how to improve it without changing bearings or other
>> parts, if there is a way.
>>
>> Yes, the oil is 20-50.  It's a 2.1 L engine.
>>
>> Zoltan
>
> --
> David McNeely