outboard engine oil

[rocki]

got a used yamaha 75 4 stroke, whats a good engine oil to use? stick with yamaha or is there some other good oils out there?

[boatfixer]

Look in the owners manual for the api service recommendation. Then go with a name brand oil. Yamaha, Quicksilver, Amsoil. Just make sure it is a marine 4 stroke oil with the correct api recommendation.

[theoilman]

I believe that all 4-stroke outboards today require the NMMA FC-W ("Four Stroke Water") specification.

You can definitely do a lot better than the oem lubes!

AMSOIL 4-stroke marine lubes (FC-W certified) exceed the oem performance in protection by better than 50%! Data charts are on the following links:

AMSOIL 4-stroke Marine 10W-30

AMSOIL 4-stroke Marine 10W-40

[LMITOUT]

I have a 90 4-stroke and use the Yamaha oil. I figure as long as it's under warranty I'll use their oil so there is no questions. Better safe than sorry, and I figure as much as the engine costs it's worth the few extra dollars for the Yamaha oil.

[Northlander]

I use the Amsoil 4 stroke in my Yamaha 115 4 stroke and it has been great. No oil related problems in the 5 years I have been using it.

[Casey Sunsdahl]

I use Amzoil in all my equipment.. 2 2 stroke outboards auger chain saw and 4 stroke outboard.. well worth it.. my biggest thing is the no smoke factor.. gotta love that.. and all your smaller engines will idle smoother and troll/cut better.