Originally Posted by 40 to 332

I agree with Rusty.

Based on your earlier experience, have you considered the possibility that your "usual oil" was put aside (inadvertently) by the service rep at the front desk of the dealership and not brought to the attention of the oil change "technician", who simply followed his/her regular routine and went to the bulk drum of 0W-20 oil and pumped that into your car? In other words, are you certain that they used the Castrol 5W-30 that you provided?