Dear Mr. albert champion:

Based on your itemized list, it's 100% obvious that they used synthetic oil (Castrol Syntec) for your car's oil change.

I must say that using synthetic oil in your 1997 c140 is perfectly OK, and actually recommended. However, if you asked them to use dino oil and they used synthetic oil, they should not charge you at the synthetic oil price. Your total oil change cost would be $60 if they used dino oil (Castrol GTX: $2 x 8.5 qts= $17).

Eric