Sunday, July 19th, 2009 AT 1:49 PM
After changing my engine oil and the oil filter, I noticed that the engine sound changed a little bit. The recommended engine oil is 5W-20 but it was changed with 20W-50. But when I noticed the change in sound, I had to remove the oil and change it to 0W-40 as I couldn't get the recommended 5w-20. But the noise is still there, as if the engine is dragging, and there is a return noise any time the engine is accelerated. Could it be that the filter is inferior?