The dealer could not duplicate on mine even though the tech drove it quite a ways I told them it just does it ever so often. Mine does this bounce around after engine has been on quite a while one day I was on the freeway had been driving for 20 mins early morning light traffic cruise on 65 happen to look at oil gauge it jumps up to 60 or more then bounces back to like 25 then moves back up then just as quickly as it starts the gauge settles back into 40psi and does not do it again for a while, it may do it more often than I observe but I don't tend to stare at my gauges, it seems to do it a lot when on cruise control around 40mph if I could safely do it and know when it is going to do it I would video it with my smart ass phone to show the service advisor?