Same place you check the level.
For a 90hp Mercury two-stroke outboard, you should use a high-quality lower unit gear lube specifically designed for outboard motors. Mercury recommends using their own brand of gear lube, such as Mercury High-Performance Gear Lube or Quicksilver Gear Lube, which offer excellent protection against wear and corrosion. Always check the owner's manual for specific recommendations regarding viscosity and any additional requirements.
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When you are looking for the object that is known as synthetic gear lube you can go to a store that is known as Wal-mart and buy gear lube for the car that you are driving.
The price for Gear lube varies, depending on the brand and they type of lube you are looking for. On amazon. com you can get a 1.25oz tube of Oster Gear Lube Clipper Grease for under $5.00. You can also get a tube Sier Syntletic Gear Lube Volv0 can run you $185.00.
Check your fluid level, the input shaft will get noisy and fail when the transmission is allowed to get low on gear lube.
The recommended type of gear lube is a GL4 in a viscosity of 75W90.
pull the check plug it will either be gear lube or auto trans fluid
Gear lube is thicker than both ATF and motor oil.Gear lube is thicker than both ATF and motor oil.
No.
Mercury® Marine High-Performance Gear Lube from Basspro
80/90 gear lube