Just so everyone knows, a Pontiac Vibe is essentially a Toyota Matrix/Corrola in drag. Motor, transmission etc are common to all. My car has the 1.8 liter engine and a 5 speed manual transmission.
New from the dealer, factory fill is 5w-20. Checked the gas mileage a few different times, 32 mpg in mixed driving, 35 mpg on a highway trip.
Changed the oil at 3000 miles. Pontiac dealer put in 5w-20. Checked the gas mileage again. 32 mpg mixed, 35 mpg highway.
Changed the oil at 8000 miles. Different Pontiac dealer put in 5w-30 oil. Checked the gas mileage again. 30 mpg mixed, 33 mpg highway.
The factory calls for either 0w-20 or 5w-20 weight oil. At this point, I suspect the factory is correct.
Best Wishes, Mark Shuell.
New from the dealer, factory fill is 5w-20. Checked the gas mileage a few different times, 32 mpg in mixed driving, 35 mpg on a highway trip.
Changed the oil at 3000 miles. Pontiac dealer put in 5w-20. Checked the gas mileage again. 32 mpg mixed, 35 mpg highway.
Changed the oil at 8000 miles. Different Pontiac dealer put in 5w-30 oil. Checked the gas mileage again. 30 mpg mixed, 33 mpg highway.
The factory calls for either 0w-20 or 5w-20 weight oil. At this point, I suspect the factory is correct.
Best Wishes, Mark Shuell.