They did use Mobil 1 0W-40 because when they reset the FSS they couldn't do it via the dash **** method. They had to use the computer interface connector and it asked what SPI rated oil was used during the oil change. MB has two different oils specified for the Crossfire and depending on which oil is used, the FSS will be reset to either 7000 miles or 8000 miles. So they had to bring out the empty bottles of oil to get the SPI number and to make sure that all 9 bottles had the same number (I demanded that!). But back to the the overfill, they had put all 9 quarts in, not 8.5, so they drained a half a quart (with me watching underneath the car). I had to let them know that with my NASCAR experience in working with Penske that I had some knowledge on changing oil!