I have a 2011 1GR-FE engine that calls for 0W-20. Some 2010 versions of 1GR-FE use 5W-30. I found no differences in part numbers for the crankshaft, main bearings, rod bearings, camshaft, cam bearings, pistons, piston rings, oil pump and VVTi. I live in a hot climate and decided to use 5W-30...