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68redlines73 68redlines73 is offline
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Join Date: Feb 2006
Location: SF/Bay Area, CA
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Hydrocrack is a slang term for hydroprocessing, the first part of a process used for making Group II or III base oils...vs. solvent-refined Group I base oils...

Chevron Lubricants - Base Oils - Isodewaxing

Here is a primer on what defines the various groups of base oils...

Chevron Lubricants - Base Oils - Meeting GF-4 Group I vs. Group II
Old 01-14-2010, 07:12 AM
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