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Just picked up a 1999 four trax for the kids. Need to change all the fluids, I need a sevice manual or direction on the oils, gear boxes etc.
 

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Welcome to the forum. What size of motor do you have and is it a 4x4. You can go to the AMSOIL Product Lookup Guide and check out some recommended oil, oil filter and spark plugs. For the motor you need to make sure the oil is wet clutch compatible so don't just use regular car oil. I would recommend the Formula 4 - Stroke Oil. It is an excellent synthetic oil and is wet clutch compatible. I am not finding the differential fluid in my book I believe it will take 80w - 90.

Let me know if I can help with anything
Mark
 

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Yeah, that's correct. The diffs use 80W-90 gear oil. My manual says to use Honda GN4 10W-40 motor oil in the transfer case, but most people use 80W-90 gear oil in it.
 
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