Can I use a synthetic motor oil,like mobile 1, royal purple, pennzoil platinum in my

[Dr. Sinister]

'08' Mazda 6i (4cyl)..? It has 40k miles and could I see a small bumb in power and in gas mileage?

 

[pedro7of9]

yes you can use it...but the gain in power and mileage is so small hard to measure.....i agree with guy who sez important part is oil is clean and full...not really important which oil.