what oil is the best for nxt drives
i have heard a few different types
anybody know?

Use Merc stuff while under warranty. Mine looks good at each service unlike my old bravo's did at changes. What boat are you running them in.

Redline heavy duty shockproof

AMSOIL Severe Gear 75w-110. Warranty or not. By law a manufacturer can not void a warranty for using a different brand of product as long that product meets or exceeds the minimum specification required.

I have heard good things about Amsoil and if warraty is not an issue I also will use it next time. But the gear lube does look really good when changed maybe due to the sealed units.

Are you guys having good luck with NXT's? I'm finding the set up very difficult to dial in. I would like to see some side by side Vees and compare notes.