If it is a recommended oil by the manufacturer, yes. Otherwise, no.
You can only use 10w40 if it is listed in your owners manual as an acceptable weight of oil for the engine.
yes if makes your car faster
5w30 in winter 10w40 summer 5w30 from 0 to 90 degrees over 90 use 10w40
10w40 summer,5w30 winter
Absolutely not.Use exactly what the manufacture recommends and nothing else. You should use 5w30 by what the oil fillcap shows..
5w30
Yes you can use 5W20 oil instead of 5W30. One is just thicker then the other. The 5W20 is better in the winter and the 5W30 is better in the summer.
I use 10W40. but u can use 10W30, 15W50(really cold climate), 5W30, 5W50. i recommend 10W40 though.
Sure you can if you want to shorten the life of the engine.
10w40 is a thicker oil than 5w30. I would only use 10w40 in an older motor in the summer, if the motor was using too much 10w30. The thinner oil will not have the higher pressure. Pressure that this motor needed.? I would go back to the 10w40 and see if the knocking stops...the damage may already be done.
5w30 in the winter. Can use 10W40 in hot weather. No heaver, are it will burn up the valve train.
No it is not. Only use the weight oil that Toyota recommends. That is SAE 5w30. Using SAE 10w40 would be foolish.