Just as important as what is covered is what is usually not covered under a Mercedes-Benz M-Class windshield replacement warranty. In most cases, warranties do not cover new damage from outside impact such as rock chips, gravel hits, or cracks that happen after installation because something struck the glass. They also typically exclude collision damage, vandalism, and severe weather impacts; those situations are commonly handled through an insurance claim, and windshield replacement is often paid under comprehensive coverage rather than collision or liability. Many warranties also exclude rust, prior body damage, or pinchweld corrosion that prevents proper bonding. If the metal frame around the windshield is compromised, achieving a long-term leak-free seal can require body repair before any installer can confidently stand behind the result. Pre-existing problems are another frequent exclusion: old leaks from a sunroof drain, prior windshield installations, or wind noise caused by worn door seals can mimic windshield issues but are not caused by the new glass. Finally, misuse or neglect can void coverage, such as removing retention tape too soon, slamming doors during curing, using a high-pressure car wash immediately after replacement, or ignoring a growing rock chip. Separately, most factory and extended vehicle warranties do not cover environmental glass damage, so it is important to separate vehicle warranty from installer workmanship warranty. If you are unsure whether something is warranty-related or insurance-related, document the symptoms, note when they started, and contact Bang AutoGlass so we can help you triage the cause and the fastest next step.