Wondering what gear lube people are running for extreme performance gear lube. Merc racing in them now and always has been.

TCM upgraded Bravo XR drives service intervals every 20hrs price not a concern performance and quality are.

https://www.wholesalemarine.com/merc...-gear-lube-qt/

https://www.amsoil.com/p/severe-gear...?code=SVTQT-EA

Blown 523s 875hp a piece
Planning on running Valvoline 20-50 VR1 motor oil 20hr service intervals

https://shop.advanceautoparts.com/p/...B&gclsrc=aw.ds

Thoughts suggestions good or bad.

George at AADS does not recommend using the Amsoil Severe Gear. It's too slippery and the clutches are getting burned out. I run NEO oil, it's what George warranties his drives with.

Bravo Shop Neo Oil would prob be my choice, but I have only heard good about the newer Merc Exteme

All 3 are fine and the only difference you will notice is in your head that warm and fuzzy feeling until you pull the drive magnet and it's full of warm fuzz!

The Amsoil Severe gear was tested equal to the bravo shop neo oil by the guys who designed it but obviously that's not public info....

I use 50/50 Amsoil Severe gear / Marine Lube.

I’ve never used neo oil, but have used amsoil, and had shifting issues shortly after.
I use merc hi perf or extreme. And change it every other time out.
With that much power I’d just use the merc lube and change it more often than 20hours. Not that the fluid will be bad, but I’ve saved more than 1 drive by finding a bearing flake in the oil, and tearing it down right away.

Bravos should be fine with 875 behind them, they dont even start to work till you throw 600 at them... kidding.


I like the Mystic 80/90

i fell for it. My brain went to all the gear failure noises i’ve heard live. My heart’s racing. Doh !

Lol isn't the ol saying it depends on who is driving.

Teague says 825 does anyone have experience with these drives?

I think i will just run the merc extreme I have not heard of the neo oil you all speak of.

do you think 20hr service intervals is to long? Keep in mind I'm not gonna be beating on the boat just because the power is there doesn't mean i will use it. But all BS aside i have no problem changing oil sooner oil is cheap and the life blood of the drives and motors. John said 20-25 hrs so figured that was good. But I'm always open to listening to others opinions.

you dont have to beat on a boat to break a bravo, the drive guy I use puts Merc extreme in everything from a B3 to an M8..