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Originally Posted by tomp
GM discontinued the use of the Dex-III branding and recommends Dex-VI (6) as a replacement. The only full synthetic that meets this requirement is Redline and GM fluid. However, it was quite a while ago when I researched the companies and their Dex-VI specs so others may be on board now and have it too.
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Valvoline is marketing a full syenthetic DEXVI that has the GM approved license markings on the container as well.