Cerma STM-3 Vanos Treatment | BMW Vanos O-Ring Repair

Restore Your BMW Vanos System — No Rebuild Required Cerma STM-3® Vanos Treatment is a one-time pour-in ceramic treatment that revitalizes deteriorating rubber piston seal O-rings inside your BMW vanos unit. If your BMW (1993–2006) is showing signs of vanos failure — rattling, power loss, rough idle, or hesitation — Cerma Vanos Treatment can restore performance without a costly $800–$3,000 vanos rebuild. Simply pour in the treatment and drive. Results typically appear within 100–500 miles. No mechanic visit. No disassembly. No downtime. The BMW Vanos Problem BMW's vanos variable valve timing system relies on rubber piston seal O-rings that deteriorate over time. BMW does not sell replacement seals separately — forcing owners to purchase expensive rebuilt vanos units that often use the same failing O-ring design. Many rebuilt units fail again within 20,000 miles, restarting the costly repair cycle. Cerma STM-3 Vanos Treatment breaks that cycle by restoring the existing O-rings