<div class="FTQUOTE"><begin quote>Originally posted by: MN250R

i run 10w-40 in the front

gear oil in the rear

0w-40 weight in the engine.



I run all amsoil synthetic



2008 brute force 750 4x4</end quote></div>


10w-40 and 0w-40 is a motor oil weights not good for lubricating gears.[img]i/expressions/face-icon-small-shocked.gif[/img]

Differential gear oils are 75w-90 at least.

<div class="FTQUOTE"><begin quote>The manual calls for 85w/140 </end quote></div>

Thats more like it. [img]i/expressions/face-icon-small-smile.gif[/img]

 

I would use what the mannual says to us 85w/140

 

<div class="FTQUOTE"><begin quote>I think for an atv it's much more important to change the diff fluid regularly since it's exposed to so much dirt, mud and water</end quote></div>

If you can get water,mud and dirt in you differential housing you have a serious problem.

 

<div class="FTQUOTE"><begin quote> If you can get water,mud and dirt in you differential housing you have a serious problem.</end quote></div>

I totally agree on that one...my point is if you DO have a problem with a leaking seal or a bad breather hose, you'll never know it if you don't change your lube somewhat frequently.