M1 had a truck/suv oil and discontinued it when they came out with a 5w-30 High Mileage oil. Get the HM it's a better oil with higher HTHS, and Z/P additives anyway.
I used the M1 T&SUV %W-30 in my Outback and Montana. The PDS showed it was slightly thicker, not sure if it was any better than regular M1. But the price was the same, and my wife liked the purple label.
Since it is no longer available, I have gone to M1 HM 5W-30 in both vehicles. The Outback engine runs much quieter on HM.