5w30 is teh booombz ! not really sure, could be placebo, but i used a 15w40 one time, and tried 5w30, ive noticed that the engine cranked quicker on startups, and acceleration seemed a bit quicker
http://www.toyotanation.com/forum/104-5th-6th-generation-2002-2006-2007-2011/207708-official-gen-5-6-camry-picture-thread-please-keep-chat-minimum.html check here for some inspiration