TROUBLESHOOTING DIESEL ENGINES
LIQUI MOLY Solutions: Tapping / Clicking Engine Noise
This is usually caused by lack of proper lubrication in the engine's hydraulic lifters. When worn or inadequately lubricated, these make a particular clicking noise not hard to recognize by a professional mechanic.
Use LIQUI MOLY (pour in oil) Hydraulic Lifter Additive to improve lubrication and dampen the noise from worn lifters.
Other possible causes:
1 - Dirty Air Intake System (EGR Valve)
2 - Wrong motor oil viscosity or Low quality motor oil
3 - Accumulated sludge in engine chamber / Old motor oil.
OIL CHANGE SERVICE REQUIRED: Professional Service
- Clean the motor oil system to remove accumulated sludge before adding fresh oil See