sorry dont know where to post this. had the wifes malibu worked on for a intake manifold gasket (luckly under warranty). I just changed the oil a few days before I took it in. got the car back and the engine is very noisy now. I looked on the work order form .it said they changed the oil. now this ****** me off as I just changed the oil. so the oil coundnt get that contaminated. so my question is the oil filter the cause of the noise or the oil as I dont know the weight as they did not put the lil OIC sticker on the car. or maybe they just changed my filter. I am mad as I had a napa gold filter on it. going to tell them they owe me some money from my oil change I did a few days before I took it in. BTW the parts look alot cleaner through the oil cap now. see alot of silver now. not a red tint any more. so atleast I know no sludge built up in the engine. any input guys and gals.