A6420901686 TurboCharger Fits Mercedes ML GL GLK S350

Product Specification

Product Function Description

The turbocharger is a critical component for boosting the performance of your Mercedes-Benz OM642 diesel engine. It works by compressing more air into the engine's cylinders, allowing for more efficient fuel combustion and a significant increase in power output. For Mercedes-Benz ML350, GL350, S350, and compatible CDI models equipped with the 3.0L OM642 LS DE 30 LA engine (190kW/195kW variants), a properly functioning turbocharger is essential for maintaining towing capacity, acceleration, and overall engine performance.

Common Symptoms of a Failing Turbocharger

If you are experiencing any of the following symptoms, your turbocharger may be failing and in need of replacement:

• Loss of engine power: Noticeable reduction in power, especially under load or during acceleration

• Excessive black smoke: Dark smoke from the exhaust under acceleration – this indicates incomplete combustion from insufficient boost

• Whining or screeching noise: Unusual noise from the turbo area that changes with engine speed – this suggests bearing wear or damage

• Oil consumption increase: Significant oil usage or visible oil in the intake or exhaust pipes – this indicates seal failure

• Check engine light: Diagnostic trouble codes related to boost pressure or turbocharger performance appear

• Difficulty climbing or towing: The vehicle struggles to climb hills or tow loads that were previously manageable

If you have confirmed these symptoms through inspection, replacing the turbocharger is the recommended solution. The electronic actuator is a known wear component on these turbos; if replacement is needed, it is available separately .

When This Part Matters Most

This turbocharger is particularly important for vehicles that are:

• Used for towing, highway driving, or heavy-duty hauling – these conditions place higher demands on the turbo

• High-mileage vehicles where original turbo bearings and seals have degraded over time

• Showing early signs of boost pressure loss or power reduction

• Mercedes-Benz ML350, GL350, S350, CLS350, E350, and C350 models with OM642 engines from 2010-2016

In these conditions, the turbocharger works harder and is more susceptible to wear, making regular inspection and timely replacement essential for reliable vehicle operation .

Product Attributes

 Installation Tips & Common Mistakes

The Mistake When Replacing a Turbocharger:

❌ Wrong: Failing to prime the turbo with oil before first start, or not initializing the electronic actuator.

✅ Correct:

1. Always prime the turbo – Fill the oil feed port with clean engine oil before starting.

2. Replace the engine oil and filter – Old oil may contain debris that can damage the new turbo.

3. Initialize the electronic actuator – The VGT actuator requires proper calibration using a diagnostic tool.

4. Use new gaskets – Reusing old gaskets is a common cause of exhaust or oil leaks.

5. Check oil supply line – Ensure the oil feed line is clear and not blocked.

Package Contents

• 1 × Turbocharger Assembly

• 1 × Gasket Set (varies by supplier)

• 1 × Electronic Actuator (pre-installed or separate)

• Protective packaging with part number label

Note: Contents may vary by supplier. Confirm with your specific seller.

Common Customer Concerns & Our Solutions

We understand that purchasing a turbocharger can raise questions and concerns. Here is how we address the most common issues our customers face:

"What if I install it and the problem persists?" – If power loss continues after installation, check other components such as fuel injectors, air filter, and the electronic actuator . Ensure that the root cause of the previous turbo failure has been identified and rectified before fitting the new unit .

"What if the part arrives damaged or doesn't meet quality expectations?" – Every shipment is inspected before dispatch. If a part ever arrives defective, we'll arrange a replacement immediately.

"What if I need the part urgently and can't wait for standard shipping?" – We offer expedited shipping options and can prioritize your order when you need it fast.

 After Replacement Still Having Issues?

Replaced the turbocharger but still having issues? Check these:

1. Was the turbo primed with oil before starting? – Failure to prime can damage the new turbo immediately

2. Was the electronic actuator initialized? – VGT actuator requires calibration with diagnostic tool

3. Is the oil supply line blocked? – Restricted oil flow can cause bearing failure

4. Are there air leaks in the intake system? – Boost leaks can cause power loss

5. Is the engine oil and filter new? – Old oil can contaminate the new turbo

6. Are the intercooler and pipes clean? – Oil in the intercooler from the old turbo should be cleaned

Quality Assurance & Service Commitment

Quality Assurance:
Every component is manufactured under controlled production processes to ensure consistent dimensional accuracy and material integrity. Each unit undergoes the following quality checks before packaging:

• Dynamic balancing test – turbo rotating assembly is balanced to specifications

• Bearing clearance inspection – critical clearances are verified

• Electronic actuator test – actuator function is verified

• Seal integrity check – oil and air seals are inspected for proper fit

• Surface finish inspection – corrosion protection and surface quality are visually verified

Packaging Protection:
Each turbocharger is individually sealed in protective packaging to prevent contamination and physical damage during storage and transit. The packaging includes a clear part number label for easy identification.

Service Commitment:

Related Product Recommendations

Engine Oil and Filter – The turbocharger relies on clean oil for lubrication. Old oil may contain debris that can damage the new turbo. Always replace oil and filter when replacing the turbo.

Oil Supply Line – The oil feed line supplies oil to the turbo bearings. Over time, it can become restricted by oil residue. Inspect or replace to ensure proper oil flow.

Air Filter – A clean air filter prevents debris from entering the turbo. Inspect and replace if needed.

Intercooler – Inspect the intercooler for oil contamination from the old turbo. If contaminated, clean or replace.