Ignorance is bliss, at least for a while.  My worn 1.9 with 140k miles runs
5-8 psi idle after a run on the freeway, and 22-26 psi at 3000 rpm when hot
with Mobil 1 15w-40.  Pressure is 60 psi at cold start up. This is in nice
temps, about 70 degrees, and mostly flat terrain.  I knew it was bad, but I
just want to get another 2000 miles out of this engine, and I'm staying on
the NW coast this summer to avoid long climbs and hot weather.  I wonder if
20w-50 would boost it a little.  STP?  Or just forget about it?

What do you think?

Stuart