2018 Mercedes-Benz Cls-Class
Vehicle Specs & Maintenance Data
The 2018 Mercedes-Benz Cls-Class maintenance specs on this page cover the key fluids, torque values, and wear items you need for routine service. Use these numbers as a quick reference when performing oil changes, tire rotations, brake jobs, and other scheduled maintenance on your Mercedes-Benz Cls-Class.
For oil changes, the 2018 Mercedes-Benz Cls-Class takes 0W-40 Full Synthetic motor oil with a capacity of 8 quarts. Brake fluid type is DOT 4, the recommended coolant is MB 325.0 (Blue, silicate-free), and transmission fluid is MB 236.14. Always use the manufacturer-recommended fluids to maintain warranty coverage and engine longevity.
When mounting wheels on the Mercedes-Benz Cls-Class, torque the lug nuts to 96 ft-lbs using a calibrated torque wrench. Over- or under-torquing can lead to warped brake rotors or loose wheels. Re-torque after 50 to 100 miles on newly installed wheels.
Owners of the 2018 Mercedes-Benz Cls-Class have reported 5 common issues including "AIRMATIC Air Suspension Strut Leaks", "LED Headlight Ballast Failure" and "7G-TRONIC Transmission Slippage". Scroll down to the Diagnostics tab for detailed descriptions, solutions, and estimated repair costs.
Specifications on this page are compiled from multiple publicly available sources including manufacturer documentation, NHTSA data, and automotive databases. Always cross-reference with your owner's manual or official factory documentation before purchasing parts or performing any service.
The 2018 Mercedes-Benz Cls-Class uses 0W-40 Full Synthetic motor oil (8 qt capacity), requires lug nuts torqued to 96 ft-lbs, takes DOT 4 brake fluid.
Manufacturer-recommended maintenance schedule for the 2018 Mercedes-Benz Cls-Class. Always verify intervals against your owner's manual.
Enter a diagnostic trouble code to see causes, symptoms, and fixes for the 2018 Mercedes-Benz Cls-Class.
Common problems reported by 2018 Mercedes-Benz Cls-Class owners, with recommended fixes and estimated repair costs.
AIRMATIC Air Suspension Strut Leaks
The AIRMATIC air suspension struts develop air leaks from deteriorating rubber air bladders, causing the vehicle to sag at one or more corners. The compressor may run constantly trying to maintain ride height.
Replace the leaking air struts. Aftermarket struts from Arnott or Bilstein offer cost savings over OEM. Replace the air dryer and compressor relay simultaneously. Some owners convert to conventional coilover springs.
Est. Cost: $1,200 - $3,000 per strutLED Headlight Ballast Failure
The Multibeam LED headlights develop individual LED module failures or ballast control unit issues, causing partial headlight illumination, flickering, or complete headlight failure. Replacement parts are expensive.
Replace the failed LED module or complete headlight assembly. Mercedes headlights are sealed units, making individual LED repairs difficult at the dealer level. Specialized headlight repair shops may offer module-level repair.
Est. Cost: $1,500 - $4,000 per headlight7G-TRONIC Transmission Slippage
The 722.9 7-speed automatic develops torque converter shudder and gear slippage, particularly in 2nd and 3rd gear under load. The conductor plate wears internally, affecting solenoid performance and shift quality.
Replace the conductor plate and perform a full transmission fluid change. Torque converter replacement for shudder that persists after the conductor plate repair. Transmission rebuild for advanced internal wear.
Est. Cost: $1,000 (conductor plate) - $5,000 (torque converter + rebuild)COMAND Infotainment System Failures
The COMAND infotainment system experiences screen blackouts, CD/DVD drive failures, navigation map errors, and Bluetooth connectivity drops. The hard drive unit can develop bad sectors causing system crashes.
Dealer performs software updates and hard drive diagnostics. Replace the COMAND head unit if the hard drive has failed. Navigation map updates should be kept current to prevent route calculation errors.
Est. Cost: $300 (software update) - $2,500 (head unit)Sunroof Drain Tube Clogging
The panoramic sunroof drain tubes become clogged with debris, causing water to back up and leak into the cabin. Water damage to the headliner, electronics, and carpet results if the clog is not cleared.
Clear the sunroof drain tubes using compressed air or a flexible cleaning tool. Inspect and replace deteriorated drain tube connections. Regular cleaning of the sunroof channel prevents future clogs.
Est. Cost: $100 - $500 (cleaning) / $500 - $2,000 (water damage repair)