Outboard Gear Oil

[tom52]

Hi
Can I use any good quality motor gear oil in my Mariner 3.3 outboard gearbox or is there some special and extra expensive Mercury oil I must use ?
Thanks in advance for any advice and Merry Christmas ( If we are still allowed to use such an unPC expression !)

 

[andyball]

All the manufacturers say use special o/b oil......many ob shops/mechanics use the cheapest EP90 around (comma,for example)

 

[Col]

The main difference, is quicksilver type gear oil doesn't mix with water-EP 90 will.
It will turn to an emultion, and will break down in the event of water ingress. Quicksilver will carry on oiling, and help prevent internal rusting.
Choice is yours.

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