Using 10w30 = smoother ride? (Castrol Syntec Blend)... Engine sounds quieter and driving on a nice, newly paved road, this car finally feels like a luxury car. Up until I hit a dip or drive up a bump.. Then the sunroof and window start cracking and the front end and rear end start creaking. But other than that, car felt smooth today for some reason.

 

Well Im sure gonna sleep better tonight after reading that......