Yamaha guys

[TrevorW]

So I use synthetic oil in my motor as I believe it provides superior protection to conventional oil. I'm wondering if any of you guys use synthetics in your lower unit, if so what do you use? I am currently just using Mercury Marine 90wt gear oil, any synthetic alternatives out there?

[Hot Runr Guy]

Trevor,
admittedly, this article from BWB has some age to it, but a good read nonetheless. http://www.bwbmag.com/output.cfm?id=1891729

HRG

[TrevorW]

HRG

Thanks for the link, Funny enough I had just finished reading that article after finding it via a Google search. May I ask what you use in your lower unit?

[Hot Runr Guy]

Originally Posted by TrevorW

HRG

May I ask what you use in your lower unit?

Since the 75hp Optimax on the boat I just sold was still under warranty, I used the Mercury-spec lube.

[fishboat]

In the last 3-4 boats I've always used Amsoil lower unit grease. Never had any issues with it.

[Spallgard]

X2 Amsoil synthetic lower unit gear lube.

Plus, it doesn't stink the place up when you change it!

[TrevorW]

Alright, I will try the Amsoil stuff when I do my service at the end of the season. Like I said currently I'm running Castrol Syntec 10w40 in the crankcase and the Mercury brand 90w in my lower unit.

I use Amsoil severe gear lubes in mine and the wifes truck and have for several years. I have a dealer close by so getting it isn't an issue. Thanks guys