Synthetic oil for lower units

[MR 188 Elite]

Is it OK to change out your lower unit oil with a synthetic oil? If so, is it best to completely drain the old oil before pumping in a synthetic? Also, which brand is the best to use?

[AlabamaDale]

I use amsoil. I let all the old drain out. Pumped about 1/4 qt. amsoil in and let it all drain. then filled with amsoil.

[MR 188 Elite]

Thanks. Do you know where I can purchase amsoil?

[AlabamaDale]

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MR 188 Elite &raquo;</TD></TR><TR><TD CLASS="quote">Thanks. Do you know where I can purchase amsoil?</TD></TR></TABLE> I ordered it online from the Amsoil site. Very fast service, had it in a couple of days..

[21XDC]

I use Amsoil... I order it from Ben Wallace a BBC moderator.... Here is his store. http://www.lubedealer.com/benwallace/ He ships it right to my door step.

Get the Universal syn marine GL.

[JeffinParadise]

Royal Purple...


Major auto parts stores carry it.

[Bass Commander]

Ive used Amsoil in all of my outboards/lower units. Your local NAPA store might carry it.

[MR 188 Elite]

Thanks everyone for the information. I will order some and give it a try. Thanks again.

[Sixgun]

I'm picking up my new to me boat. It has a 90 hp Yamaha on it. I'm going to change the lower unit gear lube, as the engine has sat longer than a year. Yamaha recommends a 90 weight gear oil. All I can find is multi-viscosity gear oil 75w90 or 85w140.

Would Amsoil 75w90 or Valvoline 75w90 gear oil be OK to use?

Ray

[21XDC]

Only use "marine" GL....