Re: 50k Service/Trans service
GM doesn't even license Dexron 3 anymore and was replaced by Dexron 6, a huge improvement over 3. 6 is backwards compatable with 3 and GM even put out a bulletin saying 6 should be used in place of 3. Not that the Redline D4 is bad, but the Redline D6 has a tighter viscosity limit and is more shear stable.
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