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NYH1
01-30-2009, 11:14 AM
I have a 2000 Yamaha Big Bear 400 4x4. I'm going to change my front and rear differential fluid. The last time I changed it I went with Yamaha diff fluid. I want to switch to synthetic fluid this time. I plow and haul firewood with it. I don't beat it, I do however work it pretty hard sometimes.

I was going to use Amsoil Severe Gear 75W-90. I was going to use this for three reasons, 1- I have more then enough left over from my truck, 2- it works with limited slip diff's (my front), 3- I use their 0W-40 synthetic oil and their Superduty oil filter. Amsoil recommends I use their Universal Synthetic Marine Gear Lube because it works good if water gets inside. I've never had any problems with water getting inside my diff's.

What are you guys/gals using for diff fluid?

Thanks, NYH1.

1fastR
02-01-2009, 02:49 PM
pic

elkagrizz
02-18-2009, 12:41 PM
lucas 80-90

Clay200X
03-13-2009, 08:21 PM
everything(4 wheelers) i own/ed said use SAE "80" so thats what git used round here