Subaru recommends 5w30 for year round use, I've been running the Mobil 1 Truck and SUV 5w30, which seems to be performing great. My question is, can I use the AFE 0w-30? I bought a 5 qt jug at wal-mart today, to take advantage of the $10 rebate = $11 for 5 qts. According to Mobil 1, this oil meets the 5w30 and 10w30 spec's.