If the horsepower of your Mercury outboard lower unit is 75 and below, SAE 80W90 Gear Lube is recommended.
How do I remove the lower unit from my 1984 50 hp. Mercury outboard motor?
Never mind I figured it out
The 1973 model, 7.5 hp Mercury outboard, requires 6.8 oz. of gear oil.
No
Take it to a marine repair shop or google it up, the answer is there
It is a speedometer pick up tube.no longer used due to clogging.
Mercury® Marine High-Performance Gear Lube from Basspro
I use 80 weight gear oil.
pwd 40
first of all what oil your are talking about , i hope not engine oil because there is non that is two stroke engine. lower unit has a draining bolt on the bottom and air or fill bolt on the top of the lower unit....
yes
It is easy...remove the lower unit..about 5 bolts. If you want to see this done YouTube it...a lot of good videos for DIY.