Hello all, a quick question for Subaru owners. I just bought a 2008 Outback 2.5 XT Turbo which calls for 5W30. I'm running M1 5W30 which I hear it loves from other Subaru owners. But, Subaru recommends 3750 mile oci with the turbo models. Is it just a waste of money or can I extend these drains to 5k+?