High oil presser on 1995 Ford F-150 Lightning

When i first start my 95 lightning the oil gage is on high afterruning for a while it goes to normal. I run royal purple in it.

by in Goshen, OH on March 01, 2009
1 answer
ANSWER by , March 02, 2009
The oils viscosity is thicker when cold which results in high oil pressure but as it heats up it gets thinner which will reduce the pressure shown on the gauge