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The lower unit price is that for the 52 ounces.
it could be C or D if your mercury is liquid it would be C if your mercury is solid it would be D
It is one of two possible forms of a unit rate.
a degree
A circle can have a unit of length which could be either a measure of its diameter or radius, or of its circumference. Or the circle could have the unit of area.
If the horsepower of your Mercury outboard lower unit is 75 and below, SAE 80W90 Gear Lube is recommended.
Mercury® Marine High-Performance Gear Lube from Basspro
You don't put motor oil in a lower unit. Get a few tubes of lower unitgear lube from a marine supply dealer and a device to squirt it in. Remove the screws at the top and the bottom. Drain the old lube out. squeeze the new lube in from the bottom till it comes out the top, then re install the screws. Do this at the end of every boating season.
How do I remove the lower unit from my 1984 50 hp. Mercury outboard motor?
yes
As long as you lube up.
Quicksilver 80W-90 Premium Gear Lube
In the lower unit or gearbox
Mercury Premium gear lube is caramel-clear in color. It should be changed every year or 100 hours of use. If it gets old and smelly it should be changed. If you see white streaks you have water leaking in through a bad seal. Mercury High performance Gear lube is blue/green-clear. See more at sterndrives.com
It is a 2 stroke so it is in the gas and the lower unit has gear lube in it which can be checked by removing the upper plug on the side of the unit.
Never mind I figured it out
The Quicksilver high performance lube will work perfectly fine in a 40 hp Honda. This lube was formulated for use in larger, high demand gearcases and outdrives. The only precaution to note is not to mix this lube with other types of gear lubricant.