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GT UK said:
whats the difference between 0w-40 and 5w-50 synthetic oils?

The viscosity of the oil will differ between the two. The first number is the viscosity of the oil when cold (startup) and the second is once it's up to operating temperature. Any particular reason you're straying from the Nissan recommended 5w-30 or 10w-30?
Here's another link for everything you ever needed to know about oil, and then some =)
http://www.vtr.org/maintain/oil-overview.html
 

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Discussion Starter #3
i wanted to use mobil one and i could only find 0w40 mobil1 all the 5w30 and 10w30 oils were part synthetic and i wanted to go fully synthetic.so i thought like the guy from nz said using 0w40 should get the best of both worlds as 0w40 seems to be inbetween the both.
 

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Premium Member
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GT UK said:
i wanted to use mobil one and i could only find 0w40 mobil1 all the 5w30 and 10w30 oils were part synthetic and i wanted to go fully synthetic.so i thought like the guy from nz said using 0w40 should get the best of both worlds as 0w40 seems to be inbetween the both.
0w40 is actually sorta outside the two... it's thinner when cold, yet thicker when hot than both 5w30 and 10w30.
 
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