www.iFourWinns.com

6.2 merc engines, oil pressure on plane runs close to 60psi.
At idle port drops to 0 and light comes on but no alarm. Give it a little throttle and goes up. Starboard drops to 10psi no light. Already changed oil and filters and senders.
Any ideas??

What oil are you using? In those I’d use the Merc/Quicksilver syn blend 25/40 or better yet 25/50. I would not use a 5/ or 10/ anything!
The lowest that my old 4.3 V6 gets to after running on plane is about 25 psi at idle; after idling did a few min it will rise to about 40. I use the Merc syn blend 25/50. On plane it’s at about 60. This is an original short block from 1988 that got a top end overhaul about 7 years ago.

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88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

I use quicksilver 25-40
Going to replace pressure sensor first, is that doesn't work
I'll try thicker oil