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I would have imagined the lighter oil would be used in the diff lock equipped diffs otherwise the thicker oil could cause problems with the lock activation when cold.
oil viscousity has little to do with the amount of lubrication an oil can provide these days. i think thicker oils in diffs are more to quieten them down for joe blog end consumer who doesn't like hearing any mechanical noise.
Does the LSD oil actually matter? I didnt think the JK had a clutch type LSD i thought it was electrical courtesy of the ESP?
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