I have a 2008 Nissan Rogue...

[wbloomfield]

The owners manual says use 5w 30 oil only. I was thinking about putting in 0w 30 Mobil Syn. in it to see if I get any better MPG. What do you think and am I going to thin with the summer monthes coming on?? On need some people to give me there two cents worth...

[Jake_reps337]

from my understanding, the first number is the oil viscosity (weight) when cold, and the second is the viscosity (weight) when at operating temperature (According to SAE classification 0C is cold and 100 C is hot. so 5W30 is 5 Weight when @ 0C/32F and it's 30 Weight when it's heated up to 100C/212F - Oils sure have changed since the 70's.)
so you oil will only have 'lower' friction when cold..

If you want to save gas, use a lighter foot and you'll see a decent improvement. Using 0W30 will probably damage oil pump. if it says only to use 5W30, then you should probably only use 5W30. I have a Nissan sentra, and it has a chart in it telling you what oils to use..

you asked for 2 cents, and you got 4..

more infomation on oil viscosity: Oil Viscosity

[wbloomfield]

Can I ask you why 0W-30 will damage my oil pump? Just wondering??

Originally Posted by Jake_reps337

from my understanding, the first number is the oil viscosity (weight) when cold, and the second is the viscosity (weight) when at operating temperature (According to SAE classification 0C is cold and 100 C is hot. so 5W30 is 5 Weight when @ 0C/32F and it's 30 Weight when it's heated up to 100C/212F - Oils sure have changed since the 70's.)
so you oil will only have 'lower' friction when cold..

If you want to save gas, use a lighter foot and you'll see a decent improvement. Using 0W30 will probably damage oil pump. if it says only to use 5W30, then you should probably only use 5W30. I have a Nissan sentra, and it has a chart in it telling you what oils to use..

you asked for 2 cents, and you got 4..

more infomation on oil viscosity: Oil Viscosity