About to do my first oil change since buying my car. The recommended oil for the 2008 SRT-8 used to be Mobil 1 0w-40 full synthetic. But, evidently the business relationship between Mobil and Dodge ended sometime between then and now, and the only Mobil 1 0w-40 that I can find now is labled "for European cars". Supposedly this is because now Mobil is recommending this oil for Mercedes. Some people have said that 5w-40 can be a substitute for 0w-40 in the 6.1L. Challenger. I was going to go ahead and get the Mobil 1 0w-40 as it is labeled now for my car. Any thoughts on this? Those of you who have the 6.1L, what do you use?