I would like to take advantage of the Castrol EDGE STP 10qts (for 08 Sienna) + 2 Bosch 3311 filters (for my Corolla) offer at Autozone (60 - $14 - $4 = 42 +tax+MIRpostage), and today I saw that both the 0W-30SL and 5W-30SN are in stock... My 08 Sienna calls for "ILSAC multigrade engine oil 5W-30", so I guess 5W-30 should be a safe choice? I googled and read tens of GC threads but it is still not convincing that GC will do any better than the recommended grade oil... The van is for <5mile town trips and occasional longer (30~40 mile) trips, and my OCI is twice a yr regardless.