Recently I bought a **** Chevy Venture with ****** miles. After which I noticed that trains fluid was tan to brown. The owners manual states to change filter and fluid at ******. Clearly that was never performed due to the tannish color. Three transmission shops and two service centers advise not to do that or I could cause the transmission to fail. According to Wikipedia, the Dextron III for this era states the the fluid eventually has shear stability and fluid oxidation issues hence you developed Dextron IV. From an engineering perspective does the tannish color indicate this is occurring, can the fluid be sent to your lab for analysis to avoid changing the fluid and thus avoiding potential trans failure? Please advise.
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