How thick diff-lock oil in my bl truggy

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I'm running my 8ight-e buggy with 10k center, 7k front, 3k rear and it's is awesome on the track. Now a truggy with bigger tires I would think a 30k center would be more than enough, at least for racing... if you are just bashing OR have motor brakes then 500k is fine. I know the traxxas e-revo center diff is now shipping with 500k, even the revo platinum has 500k so it is not all that abnormal.