does toyota require synthetic oil in the 2013 avalon??
Yes. Strictly 0W20 synthetic
http://www.toyota.com/t3Portal/document/om/OM41440U/pdf/sec_08-01.pdf Page 431
Read the owner's manual. All that information is there.
run 5w-30 if you live where it gets HOT.
No, I believe I would run 0w20 as the manufacturer recommends.
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