After reviewing posts regarding to oil, I went to my dealer to ask why they put 5W30 while the manual states 0W20. The dealer said they asked Toyota already that 5W30 will perform the same as 5W20 or 0W20. I was like..........dah. If they perform the same, why the manual doesn't mention 5W30 at all.

Anyway, the dealer also points out that because 0W20 has a thinner layer, therefore there is a higher possibility of oil leakage... Anyone has comment on this statement?

Tonight they drained my oil and put in the 0W20, with an extra charge of $11 more. They didnot put in labor costs in.

I drove for 10 minutes around town, realize the engine is quieter and the milage is actually better. Outside is around 38F and i got 35MPG. I ran though 3 stop signs, 2 red lights, around 5 miles of distance.