Re: 9.8 Merc Lower unit oil
Yes, hypoid gear oil will work in the gearcase, in a pinch. Just keep in mind that Hi-Vis marine gear oil has special additives which promote mixing of water/oil and can reduce corrosion in the case of water intrusion. Regular old gear oil doesn't have this and any water in the gearcase will separate and then you'll have a nice layer of water corroding your gears and bearings.
Most Wal-Marts have a small marine section with a quart of Hi-Vis for around $4/qt. Enough for quite a few changeouts on your motor. They'll usually carry a small hand pump which screws into the bottle and that makes refilling so much easier.
If you don't have a Wal-Mart happy, try NAPA or other auto parts store, most will stock or can get the stuff.
HTH..........ed
