Vehicles using 3S-FE engine list:

Engine 3S-FE commonly faces head gasket leaks, oil leaks, and timing belt wear. Diagnose head gasket issues by checking for coolant contamination in oil or overheating. Prevent by regular coolant changes and monitoring engine temperature. Timing belt replacement every 90,000 km is crucial to avoid catastrophic failure. Oil leaks often occur at valve cover gaskets; inspect and replace seals as needed. Regular oil changes with quality oil prevent sludge buildup. Ensure the cooling system is maintained to avoid overheating, which can warp the cylinder head. Addressing these proactively ensures longevity and reliable performance in the listed Toyota models.