Auto zone is running a special until Feb 7th, 30 bucks for 5 quarts of M1 with M1 filter, good deal! I bought 5 quarts of 0w-40 to try in the Subie. I've been running the M1 HM oils in my car for the last few oci's, but AZ didn't have any. I know the 0w-40 is a top notch oil.