Originally Posted By: SilverFusion2010
Try M1 HM 10w30. And I haven't read this entire thread, so apologies if this has been suggested before, but if you haven't changed your PCV valve you should.
Oh, yes, first thing I thought of, but the Regal 2.4 engine doesn't have a PCV valve you can change. It certainly isn't in the owner's manual, and when I asked about it on buickforums.com, I was told it's all internal.
I tried the Valvoline MaxLife high-mileage oil last year, and had the same problem. You think the Mobil HM will work better?
Try M1 HM 10w30. And I haven't read this entire thread, so apologies if this has been suggested before, but if you haven't changed your PCV valve you should.
Oh, yes, first thing I thought of, but the Regal 2.4 engine doesn't have a PCV valve you can change. It certainly isn't in the owner's manual, and when I asked about it on buickforums.com, I was told it's all internal.
I tried the Valvoline MaxLife high-mileage oil last year, and had the same problem. You think the Mobil HM will work better?