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Registered
Join Date: May 2009
Location: Hawkinsville / Perry, Ga.
Posts: 1,239
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I think you hit on your problem. You changed the Oil Weight from 20W50 to 15W50 and the Brand. Go back to using a 20W50 and see if that cures your oil pressure problem.
Cheers,
Larry
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Retired USAF and Civil Service,
1985.5 NA Graphite Metallic, A never ending work in progress,
1992 968 Horizon Blue Cab "New Toy" 
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