Mercedes-Benz Cases Under Wisconsin Lemon Law

Mercedes-Benz has Wisconsin market share — particularly with Milwaukee North Shore luxury buyers. Marquez v. Mercedes-Benz USA (the seminal Wisconsin Lemon Law case) involved this manufacturer specifically. Mercedes cases are pursued under Wis. Stat. § 218.0171.

Common Mercedes defect patterns

• 9G-Tronic transmission shift issues.
• M256 inline-6 oil consumption.
• M276 V6 / M278 V8 balance shaft / oil consumption.
• AdBlue (DEF) system failures (diesel models).
• Airmatic suspension failures.
• EQS / EQE / EQB BMS, OTA firmware issues.
• MBUX infotainment crashes.
• Sprinter diesel emissions failures.

Marquez v. Mercedes-Benz USA — Wisconsin precedent

Wisconsin’s Marquez v. Mercedes-Benz USA (2012 WI 57) involved Mercedes-Benz specifically — the Wisconsin Supreme Court tightened the 30-day clock through this case. Mercedes is uniquely on notice in Wisconsin Lemon Law practice.

EQ-series EV patterns

• BMS firmware bugs.
• OTA update failures.
• Range degradation in Wisconsin cold.

Sprinter coverage

Wisconsin imposes no GVWR cap, so Sprinter configurations are covered — heavier variants are simply “heavy-duty,” which only lengthens the manufacturer’s refund/replacement timeline.

Bottom line

Mercedes cases in Wisconsin carry historical significance — Marquez is the foundational strict-construction precedent for the 30-day clock. The § 218.0171(7) doubling mechanism applies with full force in Mercedes cases.

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