Has anybody located the 5w20 grade of this oil. All grades of this have performed exceptionally well in both virgin oil analysis tests and Used oil analysis tests at Bobistheoilguy.com http://theoildrop.server101.com/ubb/ultimatebb.php I'd like to put this in the crankcase as opposed to the Valvoline I've been using. I've only run across the 10-30 and 5-30