i'd pull the sender from the side of the engine and put a mechanical gauge in there and check it.
them lights , depending on the sender specs.. can go off as low as 6 psi.. I'd hate to think it takes 10 seconds to make 6 psi.
also.. what oil, and what temps.
i'd run 5w40 in regular cold weather.. 15w40 in mild.. and 10w30 in cold cold weather / 5w40 syn / cold cold weather.. all C rated of course.
post back
soundguy