My thoughts on oil .... 1) The Toyota oil is made by ALMC (a combination BP and Caltex) of which is in Brisbane , they make a lot of oils to specification like Valvoline, BP, Caltex...... most oils are made there to the manufacturing specs. :) 2) using non Toyota oil could void your warranty. Honda uses this trick, they can test it for spectrum in a lab. There are many S2000 owners with blown up engines (5-6 in Brisbane due to a H issue. None of them seem to be replaced on warranty, any excuse, a track day, wrong oil ...... :( just my thoughts.... B)