Again, HPL has built its reputation on honesty and performance. They’re small enough that bad word of mouth in any of their product circles would do great harm to their business.As long as you're willing to roll the dice...
As @wwillson has shown, HPL delivers extreme protection (far past any shelf oil) and it’s still going. Like kschachn said, if there’s a failure it’s not due to the HPL itself. Infant mortality, poor heat treating, owner not maintaining oil levels- sure. But not an oil-caused failure.