Quote:
Originally Posted by zoomzoomers
Also, I get more confused with regards to 0w20 vs 5w20. So what are the benefits, if there are any, to running 5w20 as opposed to 0w20? And in simple terms please. 
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Its important to point out that virtually all 0w-20 oils are synthetic, yet some 5w-20 oils are not, and there is a reason for this.
At operating temperature, they are both 20w oils. The difference is how viscous they get at cold temperatures, and by cold, I mean below freezing.
In day to day use for most of the year, 5w-20 and 0w-20 are completely interchangeable.
However, it could be argued that most 0w-20 oils are better "built" per say. They usually have a higher viscosity index, which will reduce cold start wear and increase efficiency. The trade off is that they are potentially more prone to shearing out of grade (thinning with use). However, 0w-20 oils are historically very shear stable.
If you are buying synthetic oil, then there is no reason not to buy 0w-20. Chances are you are buying a better product. There is always the exception to the rule however...