ok my dart (FIAT cough cough) got weird noises that i heard in the inside, only when i first fire up, after 20 miles down the road, the nosise goes away, sound like rubber friction, however i cant heard outside, beside the valves sticking a bit, theres a code for oil sensor ( i experiment with 0w16 a while back) got the sonsor just havent change it, i got big hands, it aint my old truck where i can climb in the engine and lay there, the noise its more audible in the right side, AC works, alternators works, bells look good, i used shell 0w20, plugs been replace, i got the OEM ones this time, the thing its the noise goes away after i drive it a bit, so thats the interesting part. maybe you have encounter something similar....some people in the internet think its the cranksahft sensor or the the coils but i got no codes for that nor do i have the usual shakes, i do know that i need a new pcv, i just havent buy one ( i got to order one in ), so maybe a belt going bad? or something similar?