I bought my 2011 regal 2.4 about 3 years ago. After the first oil change I noticed a rattle noise at start up only. For the life of me I couldn't figure out why. I started reading about it and found out it's a common problem. Some recalls too but my vin was not on recall.
To get to the point, the oil filter was the problem. I tried the best Fram and a few other brands but still rattle every so often.
I decided to go with A/C Delco after the dealer recommended it. Well sure enough so far after 3 oil changes no rattle. I found out that most oil filters have a metal barrier inside with holes for the oil to go through. That barrier was restricting the flow and not letting oil reach to the furthest parts of the engine. The ac delco has a fence type barrier that allows maximum flow, that was it.
To get to the point, the oil filter was the problem. I tried the best Fram and a few other brands but still rattle every so often.
I decided to go with A/C Delco after the dealer recommended it. Well sure enough so far after 3 oil changes no rattle. I found out that most oil filters have a metal barrier inside with holes for the oil to go through. That barrier was restricting the flow and not letting oil reach to the furthest parts of the engine. The ac delco has a fence type barrier that allows maximum flow, that was it.