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A.Pires



Member Since: 02 Dec 2016
Location: Seixal
Posts: 141

Portugal 2002 Range Rover Vogue Td6 Zambezi Silver
Transmission oil

Hi all
Wich oil you advise me for the transmission GM 5L40E?
Dexron III or Dexron VI?
Cheers

Post #666070 7th Jun 2023 10:06am
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RRPhil



Member Since: 22 Aug 2011
Location: Blackburn, Lancashire
Posts: 955

United Kingdom 

Although Dexron VI ‘officially’ replaced Dexron III when the licences expired in 2006, it does have a lower viscosity when new:

Dexron III (Texamatic 7045E) : Kinematic viscosity = 7.4 mm²/s at 100⁰C and 33.8 mm²/s at 40⁰C

Dexron VI : Kinematic viscosity = 5.8 mm²/s at 100⁰C and 29.5 mm²/s at 40⁰C

If your valve blocks are worn this could potentially give problems. However, the shear stability of Dexron VI is much better i.e. it maintains its viscosity for longer. In other words, its viscosity will be higher than Dexron III after a period of use.

I’m not aware of any other reasons that Dexron VI might be an unsuitable alternative.

Phil

Post #666083 7th Jun 2023 11:16am
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