Oil pressure question

Posted by Rscott77x On 2021/11/6 13:50:03

Thoughts on oil pressure. I searched the site but did not find an answer.

My car shows a strong 40 lbs when starting cold. I am running 10w-30w Rotilla (non synthetic) because of the additive pkg... recommended by my fav Packard mechanic.

When I am traveling around 60 mph in overdrive, the oil pressure is about 28 lbs. At idle, it drops to about 22 lbs.

I have the 356 engine.

Question:. Is this within spec?

Also, when this engine was built there was no multiple viscosity oil. Is it best to run it at 30W in warm weather?