Yeah, it is hard to keep ahead of these trucks lol!

The trans 'stat gets brittle with age and it sometimes gets damaged/breaks when the tank is pulled. I'm guessing the failures after the tank is replaced is from damage during tank replacement.

Dont forget a new o-ring for the lower hose temp sender if you arent replacing the whole thing.

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04 X5 3.0i auto
03 X5 4.6is