oil pressure, again,

[Kim K Kaiser]

Hi,, after geting the regulator replaced, car seems to be running good.

Last year, i had concernes about oil pressure seemingly low,,,basically, by summer, i had gone to 20 50 oil, and my 65 mph prssures stayed a 23 to 24,, ilde at light, right at 10 or 11..  winter rolleed around in MT, so thinking that heavy oil would be too much, i drained about half, went with a little lighter stuff, and my pressure built up to 32 quicker,, it was like molasses slow on 20 degree morns,, anyway, i am now back in MS... stil have the half and half mixture,,,not really cold, but now,, for what ever reason, no matter how warm or long i drive,, i get 27 to 29 on my pressure after full warm up and on the road.  and my idle at the light is about 18,    i have done nothing to the car,, other than drop 6000 feet in elevation.

start up,, 32 to 34,,,, at warm engine, at 35 mph (per manual)  i am at 31, 32 as manual suggest to be.  

i am just kinda of wondering how or why, other than the oil thickness, would i be running at 5 lb higher pressures?  

i know that in warm weather, using 10 30, my 65 mph pressue is about 19,,, 20/50  i get 23 ro 24,, and y near idile pressures are up almost 10 psi to 19 to 20.

would any of these pressures bother anyone?,,, or should i be on guard for something,,, i drive the car 50 miles almost every day here in MS... 

thanks,,

kim

[Russ Austin]

I would not worry about it. Also try to stay with one weight of oil. 

[Anders]

From the 1964 Cadillac Shop Manual: