Well I know the vsld doesn't engage after heat up but I'm not really sure it wears out? From my understanding (zero vlsd experience but enough corvette clutch type) the vlsd works similar to something like a AT torque converter (without a TCC luck up clutch). Really no moving/ friction parts to wear and silicon fluid can take a ton of heat cycles. I'll trust others who've experienced it fail but I was just planning to get a z1/ nismo diff cover to help keep it cooler longer (not competitive enough to buy a Gilken).
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