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tapping sound on startup 93 90q

I have a 93 90scq with the 2.8l v6 and when i start it from dead cold it
makes a sound almost like the valves are rattling. This sound goes away
about thirty seconds after startup and doesn't come back until i leave it
overnight. My oil pressure (when cold) stays at 5bars, is that where it
should be? when it warms up the oil pressure comes down to 2bars and stays
there until i rev it up, at highway speeds (3000 rpm) it stays at
5 bar. this seems a little high to me . if anyone has any ideas please feel
free to voice them. Thank you all.
								Paul Dansereau
								93 90csq