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I would never tint my windows using film unless the tint is original from the manufacturer. I decided for Ziebart films for my E60 right after its delivery; then; they have managed to spill water inside the dash from beneath the windshield and caused two electronical units get damaged (the car had only 40 km. on clock; cost of repair $3000; which of course they paid; 3 week waiting period for repair as the car would not go). And after getting the car, I noticed it is not possible to use polarized sun glasses as the UV protection feature makes the view purpleish (right word/spelling? sorry). Further, the service stated that the aftermarket films void the warranty of the automatic windows (even if you get them through them). So IMO, it is better to keep everything original.
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