I'm a newbie to this site and love it! you guys are sharp. I've been using Pennzoil 5w-20 syn in my '02 Odyssey (37K miles), thene I read a UOA on this site stating it wan't much better than regular stuff. So I want to switch to M1. but I can't find it in houston, only 5w-30. My question is this. Is the -30 ok for use? Will I notice a difference in milage? I just bought a Wix filter base on readin in this forum. Plan on sending a sample of the 5-20 pen in for analysis. thanks in advance...great site here.