I know I can use synthetic oil. I changed the oil and filter at 1000 miles to Mobil 1, 5-W30. My question is, When I bring in my car soon for its scheduled oil change (I was told it was free when I bought the car from you), will you put in Mobil 1 instead of Valvoline? If you will, do you charge me the difference in cost of Mobil 1 and Valvoline (the latter is cheaper, of course)? If I want to use Mobil 1 do I have to bring it with me and pay the full cost of the oil?
In short, if I want to use Mobil 1 should I do it myself or bring the car to you as per my agreement with Rosner?