low RPM. I had the same thing on my old '91
Grand voyager that had accumulated 350,000 miles when my wife destroyed
by driving it with a coolant leak. I ran 20W-50 oil in it
to maintain oil pressure at warm idle. The problem is that heavier oil
is a 2-edged sword. It keeps oil pressure up when warm, but during
cold start-up it's thick and doesn't flow as rapidly just when you need
it the most, to reduce wear during cold start-ups. So you actually wear
out the engine (and thus the bearings) faster this way.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.