FWIW, my Honda dealer here in Mpls told me the Honda brand 0W20 oil is SEMI-synthetic and NOT full synthetic. That seems logical to me because they charge $39 for a 0W20 oil change and to get full synthetic almost anywhere it cost you around $60 for an oil change. Full synthetic Mobil 1 0W20 cost $6.50 a quart at Walmart, so you are already over $33 just for the oil. Add labor and a good filter and your at the $60 mark.
0w30
Yes. SAE 0W20 means that the oil has zero viscosity in winter. This oil does not exist, which is just as well because if it did it would drain right down into the sump leaving the engine unlubricated. Several companies make a SAE 0w20, including AMSOIL and Toyota. In cold temperatures the oil is thicker than at warm temperatures. Because it has a lower viscosity, it lubricates the engine faster than a higher viscosity oil. Toyota is specifying 0w20 next year.
Synthetic 0W20
not a good idea 0w20 is very thin oil. unless your engine calls for it it will go right through your piston ring & burn the oil. 10w 30 is a much thicker weight.
5w20 or 0w20- either is ok by Toyota
Just use what Toyota recommends unless you live in a extremely cold place,then I'd go 0w20 because it flows better in the cold.
5w20 any premium brand. UNless you have a hybrid, the 0W20.
Use Mobil 1 or equivalent.
Use only what Honda recommends which is SAE 0w20 Any major brand.
It varies from one brand to another but it averages around $7 per quart.
depend on the year of the car. most would take 5w20. new models ask for 0w20