2004 optimax gear oil

[BrandonCook]

I'm wondering what gear oil you all are using on your 2004 mercury optimax lower units. Also when changing do you replace anything else other than the oil? And how many hours can you go between oil changes?

Thanks

[blkdog812]

once a year and use the premium high performance merc gear oil

[norcalracer]

Mercury or Quicksilver (same lube) Change every 60 hrs or once a year.And every other service do a impeller change!

[drew]

There are two different lubes, Premium and High performance. They can be labeled Quicksilver or Mercury. You need the High Performance. I usually buy mine at wally world.

https://www.mercurymarine.com/en/us/par ... gear-lube/

I'm wondering what gear oil you all are using on your 2004 mercury optimax lower units. Also when changing do you replace anything else other than the oil? And how many hours can you go between oil changes?

Thanks

[BrandonCook]

So there is no difference at all between mercury and quicksilver? I should just stick to one?

[drew]

Quicksilver is a Mercury brand. They are exactly the same. It does not matter which is used. They both come in the premium and HP. You would need the HP in either label.

[bryanmc]

Quicksilver is the same product, just sold by non Mercury dealers.