Re: Lower unit Gear oil
You may not be getting replys because your post is kind of in the wrong forum. It is not Suzuki/Yamaha specific so a lot of people will ignore it.
Also, if you do a search you should find tons of hits on lower unit oil. Read JB's post on how to get the most out of your question. It has a lot of good pointers.
That being said I personally use standard marine rated lube. I use the Wal-Mart brand and change the oil every 6 months ($4 - $8 per change). I read that synthetic holds up longer and works better if water does get in the lower unit but it also costs more so it's a wash in my opinion.