I am on a road trip with my "new to me" 2006 M5. Today the oil add caution came on and I was no where near a BMW dealership, so I stopped at a jiffy lube to have the oil changed. There system recommends the 10W60, or the fully synthetic 5W30 they had on hand. As they had no 10W60, I had them change it out with the 5W30. According to thier documentation, it does meet the BMW required specs, but I'm now worried. Should I be? HELP!