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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2002 Buick Regal GS (3.8 Supercharged) PP, Pure 1 filter
2008 Sebring Hardtop convertible (2.7) M1, Pure 1 filter.