I don't have any data just some thoughts.

I always thought that tran fluid temps of 220f to 230F were normal. You are running 150F with the added cooler. that's 70f. I would think that would be great for extending the life of the trans.

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2002 BMW X5 3.0
2006 Ford Explorer 6 cyl
1998 VW Jetta 2.0 GLS
2004 Honda VTX1800C 100hp 97 lb of torque