There is no gear oil in it. The motor oil does every thing. Use 10w-40 Oil
regular 10w40 motor oil
I use 80 weight gear oil.
Gear oil is normally a much heavier oil.
if it is a manual transmission no gear oil!! regular 10w-40 motor oil any brand it does not matter
Gear lube is thicker than both ATF and motor oil.Gear lube is thicker than both ATF and motor oil.
Nothing goes in there the only oil that lubricates the motor is in the gas
Yes, you can use 75w-90 gear oil instead of SAE 90 gear oil
For the 80 hp Mercury, you may use any brand of gear oil that has been blended for use as an outboard motor gear lube. There are many brands available other than oem, and are specially formulated for outboard use.
Viscosity and additives.
Most manual transmissions use 80W90 gear oil. To be sure, check your owners manual. I have seen one use 30w motor oil.
Yes that's why antifreeze is used, these are the freezing points of some types of oil. Motor Oil (15W) +15 Motor Oil (30W) 0 Hydraulic Oil, Gear Lube & Gear Oil -10 Motor Oil (10W30) -20 2-Cycle Oil -25 Motor Oil (5W30) -30 Mobil 1 Engine Oil (15W50) -35 Antifreeze -40 Mobile 1 Engine Oil (15W30) -55