"Cardboard vs metal caps - one protects, one destroys. Carquest expert breaks it down: cardboard caps save pennies but create catastrophic failure points. Heat cycles, pressure spikes, vibration turn cardboard to mush. When it fails? Unfiltered oil floods your engine with contaminants. 🔧 Metal caps handle system pressure without degrading. Won't soften, collapse, or disintegrate when things get hot. Mechanics know cardboard failures mean scored cylinders and spun bearings. Your engine faces extreme conditions daily - don't gamble on cardboard. Ever pulled a filter with failed cardboard cap? Drop what you found below and tag someone who needs this reality check! 🛢️ #CarquestAutoParts #OilFilters #ExpertAdvice #AutomotiveParts #MechanicLife #AutoRepair #EngineProtection #ProfessionalMechanic #MetalCaps #AutomotiveExpert #GearheadLife #AutoShop #QualityParts #FilterFails #AutoMaintenance"