Well I just drove to walmart and my car was bone cold. It's like 40* F outside. I noticed whenever my rpms went over 2100 I hate a wierd chattering sound - could this be the oil my friend put in? He put in Mobil 1 Synthetic 5w20. I usually use Castrol Syntec 10w30 (in colder times). Could that be what is causing the chatter??

 

Change it back and see. If thats the only difference in the car its probubly it.

 

yea, im changing it this weekend