So a few weeks ago I dumped the QSGB 5w20 I was running with a puro classic at 4.5k and put in napa synthetic 0w20 and a NAPA gold filter. I have about 750 miles on it and just got back from a 400 mile thanksgiving trip. this oil seems to make the engine sound a lot louder at idle than any prev oil I have used. this is the first 0w20 I have ever ran. these engines seem loud anyway, my moms sonata sounds loud also, same exact drivetrain. Anyone else having this experience? this is basically synpower right?2010 optima 4cyl 2.4l. not a gdi engine. thanks for any help and suggestions. was thinking about some mobil 1 0w30 next oc and see if that quiets anything down, should be a lot thinner than gc right?