I've been lucky enough to be dealing with some monster-psycho "brainwashed" TOYOTA/Lexus owner who belives in super-extended ocis on a "premium" brand of oil and testing to support it. Fair enough. Seemingly, he rejects any and all notions that plain API oil will work fine and insists that his 1998 Lexus does not even require an API-licenced oil. I call bunk. Anyone have access to a TOYOTA manual or first-hand knowledge of their requirment?