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Texamatic 7045E was a Dexron III fluid, for which the GM licences expired in 2006, so that’s amazing if it is still available. GM moved users on to Dexron VI, but there is a potential issue in that its viscosity (new) is lower than that of Dexron III. Not necessarily a good thing if your valve blocks are worn, which is a particularly common issue with the 5L40-E! The justification is that the better shear stability of Dexron VI means the viscosity remains at its design specification for longer i.e. after a period of use it will be higher than ‘worn out’ Dexron III. I suspect that the BMW fluid that you mentioned is Dexron VI.
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Someone on another forum asked if I thought a fluid called Texaco ATF HD 389 might be a more suitable alternative than Dexron VI. It has a kinematic viscosity of 7.1 mm²/s at 100⁰C and 34.9 mm²/s at 40⁰C. This compares to 7.4 & 33.8 for the original Texamatic 7045E fluid and 5.8 & 29.5 for Dexron VI so, on the face of it, it would seem a more suitable replacement for Dexron III than Dexron VI. Just my opinion, obviously.
Phil
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29th Jan 2025 2:45pm
) and see if i can source some 7045e in the meantime.
