Keeping your Nissan Pathfinder engine in top condition requires consistent care and attention to detail. First, change your oil every 5,000 miles using the manufacturer-recommended grade. Second, inspect and replace air filters regularly to ensure optimal combustion. Third, monitor coolant levels to prevent overheating during long drives. Fourth, check spark plugs annually to maintain fuel efficiency and smooth acceleration. Fifth, listen for unusual noises that may signal early mechanical issues. Following these five proven steps protects your investment and extends engine life significantly. A well-maintained Nissan Pathfinder engine delivers better performance, improved fuel economy, and fewer unexpected repair bills over time.