w/my extended warrenty in hand i recently took my 99 diesel to the 5 star garage and requested they address what appeared to me to be a noteworthy seapage of oil from the rear of the valve cover... they claim you dont have an oil leak unless it drips at the rate of 6 to 8 drops a minute... has anyone ever heard of this? also looking for any information on aftermarket valve cover or any way to clean the existing pitted cover... ? tks, Roger