NHTSA complaint #11683838

Owner complaint summary

Catastrophic engine failure on 2020 Lincoln Navigator at 93,000 miles. Oil contamination in cylinder 6 caused complete compression loss due to piston ring failure. The engine suffers from failed cam phases and excessive carbon build up which are known failure points of this engine. Ford Technical Service Bulletins 20-2423 and 23-2143 document this as a known manufacturing defect for vehicles in my build timeframe, proving Ford was aware of this problem before production. This is premature engine failure requiring complete engine replacement on a 5-year-old vehicle. The failure pattern matches ongoing class-action lawsuits against Ford for EcoBoost engine defects. Safety concern: Catastrophic engine failure without warning while driving creates risk of sudden loss of power and potential accidents. Lincoln customer service has admitted these vehicles have this issue but refused escalation despite documented manufacturing defect and broken multiple callback promises. Request NHTSA investigation into 2020 Lincoln Navigator 3.5L EcoBoost engines for premature piston ring/compression failures related to carbon buildup and failed cam phasers as documented in Ford's own service bulletins.