2007 Vibe with 130K. The car has been on 5w-30 since new. With cold weather coming I changed the oil a few days ago using QSUD 0w-20 (on sale at Menards for a great price). This vehicle has a Toyota made 1ZZ-FE 1.8L engine and is common in Matrix and Corolla vehicles singe the early 2000's. I have owned this engine in a prior vehicle and it is a gem. I just got back from an 800 mile trip and had a few observations. 1) The car is quieter at idle. My wife even commented at how quiet the car is. Turned off all vents and listened. Very impressed. I always thought that a heavier oil would quiet things down more. Not so in this case. 2) No oil usage at all. Checked the oil before the trip, during and after the trip. Dipstick still completely full as normal. This car has never used oil though. 3) I did not notice a big difference in fuel economy. I am pretty happy with my choice for this winter. I was really worried about the car using some oil after being on a steady diet of 5w-30 its whole life.