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15% on my e46...never bothered in over 3 years. 15% on my e82...had to remove at 18 months. 20% on my e92...never bothered for 3 year lease, turned in with tint. 20% on my 987.2...never bothered in a little over 2 years. Especially if the interior is lighter...you should be okay at 20%.
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