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Originally Posted by Bonburner
As mav1178 said there was Still sludge after his first differential change. Yes there will be more after the first - yes it should be less sludge on the magnet than the first.
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No you completely misread what I wrote.
What I'm saying is this: the sludge/shavings will always be there. You change your oil based on the ability of the oil to protect the differential, not based on what sludge is left.
Same thing applies for the transmission, same thing for the engine.
For the average driver you follow the factory service interval.
I never said it was illogical, you said it. What I said is that this is absurd.
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Which is fine, just don't use buildup on the drain plug as a measure of how much contaminants are left in the oil. That's just absurd.
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If you want to change it sooner, fine. Just don't claim it is better at removing contaminants until you have UOA done.
-alex