I see alot of guys saying they run the same oil in the front diff as the engine, what about the rear diff?

The rear diff takes tractor hydraulic oil. Has to be compatible for a wet brake system.

Cheapest place I've found it is the Super Tech stuff from Walmart. Believe its about a 2gal jug and right around $20

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Run Mobil-1 10-30W Synthetic, in my dad's brute. Is it true that if you run synthetic you have to keep running it? Reason I ask is because I heard if you run synthetic, you cannot just put in regular oil on the next oil change.

Not true. You can run conventionals after synthetics. It is suggested to change it after a few miles as some synthetics don't mix well with conventionals but that doesn't hurt anything. No gelling happens. I went back to Kawie oil after Mobile 1. No issues at all.

I just switched over to royal purple 10-40.

I run purple here and love it....

I use Xado 10w-40 or 10w-60
So far the best....
http://www.xado.com/global/index.php...product_id=100

and also tried their additives.... my ATV is on 11.000km ( around 7000miles) and after i used this revitalizant it runs better when it was new.

http://www.xado.com/global/index.php...product_id=112

So how much is this Xado a quart because all the part stores around here are going to stop carrying RP in 10-40 because it doesn't sell actually all of the 10-40 oils so im buying up all the royal purple I can get and its going for six bucs a quart to get rid of it but its getting hard to find an the 10-40 in there motorcycle oil is fifteen a quart.

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Well here in Eu you can find it in 1L and 4L canisters. In US i don`t know...
If you find this Xado in US, then you should get Vitaflush too...i always use this before oil change. Usually two pakets are enough for BF 750.
http://www.xado.com/global/index.php...product_id=198

I'm going to run Cerma in mine, it retails for around 16 a quart but is leaps and bounds above RP or Lucas.

Test versus Royal Purple YouTube - Broadcast Yourself.

Test versus Lucas
YouTube - Broadcast Yourself.

I seen that a year or two ago but where can you find it at I herd that they got sued and you couldn't get it.

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The original founders went there separate ways and had a legal dispute. My girl friend is a rep for them, currently you have to get it either from a dealer or straight from the company. I checked and 10w-30 retails for 13.32. 10w-40 wasn't on her price list but were checking on the exact price. If any one is interested in getting some get me a message and you can order it through me. It would be shipped directly from the company to your door.