Fwiw, last time I took my wife's car into the Toyota dealer, I noticed a mobile windshield service van and crew working on a car behind their shop. I assume they were putting in a Toyota windshield but don't know for sure. So don't assume the work quality would be any different. I think the dealer would tell you if they do it in house or farm it out, but can't be sure. The quality of the glass is a different question.

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles