Nope. Service bulletin said the lifter design was defective -- although they used that same lifter on multiple product lines and multiple years. G8's are just the tip of the iceberg. When I took it to the dealer (who mainly does SUVs and pickups in my area), service manager recognized the symptoms instantly.

I was just tired of running an oil designed for the EPA rather than to minimize metal wear. GM still swears by that EPA rotgut (they kind of have to, CAFE standards and all).