My first pick is Truck & SUV 5w-40 but its not easily available. If I was going to stay with Mobil 1, should I switch to their 10w-30 or their 0w-40. I use it in gas engines that like xw-30 or xw-40.
brian - There are significant formulation similarities between M1 TDT 5W-40 and M1 0W-40
If TDT is not available then M1 0W-40 is a great choice. Many in EM would say that M1 0W-40 is a better product than TDT for use in petrol engines