Vehicles using M272.98x engine list:

Engine M272.98x

Symptoms:
- Rough idling and misfires
- Loss of power or hesitation during acceleration
- Engine warning light (Check Engine Light) illumination
- Oil leaks around the valve cover and camshaft seals
- Unusual engine noises such as ticking or knocking
- Reduced fuel efficiency

Diagnosis:
- Perform a diagnostic scan to check for fault codes related to ignition coils, camshaft sensors, or misfires.
- Inspect spark plugs and ignition coils for wear or damage.
- Check for oil leaks around the valve cover gasket and camshaft seals.
- Examine the timing chain and tensioners for wear or slack.
- Conduct a compression test to rule out internal engine damage.
- Inspect the intake manifold for carbon buildup affecting airflow.

Fixes:
- Replace faulty ignition coils and spark plugs to resolve misfires and rough idling.
- Renew valve cover gaskets and camshaft seals to stop oil leaks.
- Replace timing chain tensioners and guides if wear or slack is detected to prevent timing issues.
- Clean or replace the intake manifold if carbon buildup is significant.
- Use OEM parts for replacements to ensure compatibility and durability.
- Regular oil changes with the correct grade and quality oil to maintain engine health.

Prevention:
- Adhere to the manufacturer’s recommended maintenance schedule, especially oil and filter changes.
- Use high-quality fuel to minimize carbon deposits.
- Regularly inspect ignition components and replace them proactively.
- Monitor oil levels and condition frequently to prevent leaks and engine wear.
- Avoid prolonged idling and aggressive driving to reduce engine stress.
- Keep the engine bay clean to spot leaks or damage early.

Following these guidelines helps maintain the M272.98x engine’s reliability and performance in the Mercedes Benz CLS 350 CGI models from 2006 to 2010.