Oil pressure erratic
Went to cruise last night. Got going down highway about 2800 rpm for 15 minutes, temp was 180, outside temp was 95. . Looked down and had 15 # on factory gauge on 66 GTO. Motor has been together for 12 years, just driven normally. Normally runs 50-60 at highway speed. About 5 miles later needle jumped to 60 # and stayed there and acted normal when slowed rpm to an idle, 30 # at idle. Did the same coming home. This morning started in garage and had 60# cold. 30 w oil & ac delco filter. any thoughts
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