I just thought I would post this from Wikipedia. It was news to me but just as Jim said:
A single-grade engine oil, as defined by SAE J300, cannot use a polymeric Viscosity Index Improver (also referred to as Viscosity Modifier) additive. SAE J300 has established eleven viscosity grades, of which six are considered Winter-grades and given a W designation. The 11 viscosity grades are 0W, 5W, 10W, 15W, 20W, 25W, 20, 30, 40, 50, and 60. These numbers are often referred to as the "weight" of a motor oil, and single-grade motor oils are often called "straight-weight" oils.[/quote:c7fc50ac17]
Plus a little bit of motor oil trivia(same source):
[quote:c7fc50ac17]Also, if an oil does not contain any VIIs, and can pass as a multi-grade, that oil can be labelled with either of the two SAE viscosity grades. For example, a very simple multi-grade oil that can be easily made with modern base oils without any VII is a 20W-20. This oil can be labeled as 20W-20, 20W, or 20. Note, if any VIIs are used however, then that oil cannot be labeled as a single grade.[/quote:c7fc50ac17]
So there really is no such thing as an SAE 10. There is ONLY 10W.
This post was edited by TheDurk at 09:46:42 10/07/12 6 times.
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