I went to the dealership for an oil change when I first got the Z and brought my own oil (Pennzoil Ultra $30) and oil filter (Mobil 1 $10). The service advisor asks why I don't just use the factory oil and filter because its "all the same". I said how much do you charge for parts and labor? He said $85 total (give or take). So I ask him how much does labor cost? He said $12. I said well I guess its not all the same then...he nodded and I said do the math. He was still confused.
