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well i will be the first guy to pretty much do the opposite of what everyone has done.
I daily drove for nearly 2 years with a kazz 2 way with napa premium 75w90 and changed it every 6 months or so, sooner if i did an event or 2.
The friction modifier does quiet it down but isnt necessary, i personally enjoyed the clunk.
The dif still locks very hard and whenever i change the oil it is never any different color/smell then when i first put it in.
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