Could this be the beginning of automaker-specific motor oil requirements, similar to what exists in Europe and in the heavy-duty diesel market? General Motors has announced that the long-conjectured Global Engine Oil Specification (GEOS) will be a reality beginning in 2010 for 2011-model vehicles. You can read the details here, courtesy of Lubes ‘N Greases, but the long and the short of it is that motor oil formulators will now yet another batch of specifications to worry about above and beyond ILSAC’s GF-5. Some blenders may not be able to meet all the specifications with a single product, raising the possibility of a GM-spec oil and a non-GM-spec motor oil. Scary.
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