Amazon.com: PWC Parts Co Mercury Outboard Inboard I/O All Verado Optimax BlackMax Bravo I II III XR Racing High Perfornance Premium Gear Lube Lower Unit Oil Change Kit w/Pump & Gaskets :
How to Change Gear Lube on an Inboard/Outboard Motor - YouTube
Mercury Marine New OEM High Performance Gear Lube with Hand Pump, 91-8M0101435 : Amazon.ca: Automotive
Marine High Performance Gear Oil SAE 85W-90 | LIQUI MOLY