My VR gaskets failed after 6,000 miles of moderate abuse. I mean ya, the truck saw the dunes, the drap stip, trailers, and lots of WOT runs, but they should have lasted longer.
Put OEMs in about a month ago. You can tell the quality difference. There are more layers and they just seem much more robust. Everyone needs to just know the rule of thumb:
When studding a 6.0, use ONLY OEM gaskets. They were never the problem in the first place, it was the bolts.