2004 optimax gear oil

BrandonCook · Post by **BrandonCook** » Sat Mar 28, 2015 7:45 pm

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 · Post by **blkdog812** » Sat Mar 28, 2015 8:13 pm

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

norcalracer · Post by **norcalracer** » Sun Mar 29, 2015 8:20 am

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

drew · Post by **drew** » Sun Mar 29, 2015 4:38 pm

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/

BrandonCook wrote: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 · Post by **BrandonCook** » Sun Mar 29, 2015 8:02 pm

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

drew · Post by **drew** » Sun Mar 29, 2015 8:20 pm

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.