toyota has us use 0w-20 and 5w-20 in about half of our line of vehicles. the reason is for fuel economy. And they protect better at start up. The new oils are so much better than just a few years ago, they offer way better protection than say the oils of even just 20 years ago. I run valvoline 10W40 in my cars, truck, boat, bikes, lawn mower, jetski, etc. If its a 4 stroke motor it gets regular valvoline, and never ever had a problem. It says energy conserving right on the bottle, and I like that, as its a better lubricant than the other NON energy cons oils...and never have I had a seconds worth of clutch troubles.