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FWIW, Toyota put out a TSB when it went to 5W-20W oil in its 2007 engines and certain 2006 engines. The TSB did NOT recommend the lower viscosity oils in older Toyota engines. I think newer Toyota engines are built with tighter main bearing tolerances.
For that reason alone, I believe the OP should stick with the oil viscosity recommended by Honda when his car was built.
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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