I just bought a 2005 MO SL with 216k miles. I'm don't have the service records so I'm going to change all the drivetrain fluids. What engine oil should I use? Not sure if they been using synthetic. I live in Minnesota, so temps range from -40F to 110F. The vehicle is in very good condition considering it a MN vehicle. Bought for 2k ?. The CVT drops a bit hard when its warm, hopefully a fluid change will help. Leaks nothing and that 3.5 still has mad pull.