Group II vs Group II+

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What is the difference between a Group II and a Group II+ base oil? I see Group II and Group III listed in publications, etc, but I have never heard of II+ until I started reading this forum. What is this stuff, and what makes it different / better that Group II. Please clarify for a "newbie". Thanks.
 
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Group II+ isn't an official designation, but is used in the industry to indicate a Group II base oil that is on the high end of the VI range for a Group II, generally 117 to 119. Group III is 120 and up. A Group II+ is generally what's used to produce a conventional 5w30 that meets the GF-3 specs.
 
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