I also have some more valvetrain noise on my Sebring convertible with the 2.5 motor using Mobil 1 HM 10w-30. It used to be just at start up for a minute or so. Not it is on and off.
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2003 Mercury Grand Marquis. PP High Mileage oil
2008 Sebring Hardtop convertible. PP High Mileage oil
2006 Kawasaki Vulcan 900 LT