
With a fresh overhaul on my 907 '77 S1 motor. When the engine temps reach normal, I need to keep revs 4K+ to hold oil pressure up away well into the operating range on the un-numbered gage. While I'm cautioned to hold revs to 3,500 for 500 miles. I'm setting to run with a calibrated gage now to cal the old transducer and panel instrument. But I'm running 20W50 and thinking that a straight 50 would provide a measure of relief. Yes? A synthetic is preferable? Whose: Red Line, Lucas, Brad Penn, Valvoline? Thanks folks Murray