Choosing the correct gearcase oil.

[big cat 67]

Hi
I have a 1993 yamaha pro v 150. Can anyone tell me what I should be using for gearcase oil or lube? And maybe recommend some brands.
Thanks

 

[Docksidemarineservices]

Quick Silver HP gear oil.

 

[zackfactor]

that is the ONLY oil to use, however remember that once you use a synthetic like merc hp it is not a good idea to switch back to regular oil at any time.