Coal Town Kid!
You're getting some good advice here about oil from the guys on here.
Fred T has given a good explanation and it sure fits in with the experience I have had over the years.
Oil pressure should rise within 30 seconds--don't run the engine more than a minute without it. That 30 second rule has always been what I've been taught over the years. That may seem like a short period but if you try an experiment you'll see what I mean. People are poor judges of the passing of time! Take a stop watch and time those 30 seconds! You'll be surprised at how you would have shutdown earlier without timing it.
In the very early 50's I worked at a service station and we offered 'engine flushes' when doing an oil change. The flush consisted of 3 quarts of Varsol and one quart of #10 oil. The engine was run for about 2 minutes then that was drained and refilled with fresh oil. I can't say that was a good procedure though. We always used #30 oil in the summer and #10 in the winter. The manual for my 1946 truck says that for really cold weather you can add 10% kerosene. But that was before any of the lesser weight or multiviscosity oils.
George
