Syntec gear case oil

[gravel_road_cop]

Which syntec gear case oil would you recommand for 200 HPDI (2004) ?

Or, which is the best gear case for this motor ?

Tks.

Dan

[robert graham]

Most folks just used "Marine Lower Unit Oil", which is 80-90wt. gear lube with some corrosion additives to help protect against any water in the oil. Of course, Synthetic lubricants are said to offer some advantages, but at higher prices, but I've never had any problems with the straight petroleum oils. The Walmart Brands are fine.

[rodbolt17]

synthetic oils are specifically NOT reccomended for most yamaha gearcases except the V8 and 4.2L v6.