How to Change Mercury Outboard Motor Gear Lube | Mercury Optimax 2-Stroke Lower Unit Maintenance

In this video we walk through the complete process to change the gear lube on a Mercury Optimax 115hp lower unit (includes 75/90/115/125 1.5L motors). We show you factory Mercury OEM detailed steps and pictures, along with tips and tricks learned over the past 12 years servicing Mercury outboards.

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Items discussed in this video to review specs and/or purchase. As an Amazon Associate, I earn from qualifying purchases. Links included in this description may be affiliate links. If you purchase products using the links included, I may receive a commission however there is NO additional charge to you. Thank you for the support!

Quicksilver SAE 90 High Performance Gear Lube (WITH pump and special adapter):
https://www.amazon.com/QuickSilver-80...

Quicksilver 858064Q01 SAE 90 High Performance Gear Lube (WITHOUT pump):
https://www.amazon.com/Quicksilver-85...

Quicksilver Lower Unit Gear Lube Blue Drain Plug Seal:
https://www.amazon.com/QuickSilver-Lo...

SAS Safety 66517 Raven Powder-Free Nitrile Disposable Glove, Medium, 6 mil Thick (Pack of 100) Pack of 3 (my favorite gloves):
https://www.amazon.com/SAS-Safety-665...

Chapters:
00:00 - Intro & Required Items
01:17 - How to Drain Lower Unit
03:02 - Inspect Gear Lube for Water
03:33 - How to Fill Lower Unit
08:57 - Wrap Up

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