Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2021 CLS450.
The 2021 Mercedes CLS450 is defined by its precise powertrain requirements, most notably an engine oil capacity of 9.0 quarts and a specified viscosity range of 0W-20, 0W-30, or 0W-40. Properly supplying this 9.0-quart volume with the correct multi-weight oil is essential for protecting the engine's internal components under varying operating conditions. Consequently, where this model year sits in the CLS's reliability history relies heavily on strict adherence to these lubrication specifications, meaning that consistent and proper fluid maintenance is the primary determinant of the vehicle's long-term dependability.
Fluid capacities, tune-up values and fuel economy at a glance.
Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.
From the factory this vehicle uses OE oil filter 0289974745. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.
| Engine oil filter | 0289974745 alt 2561840080 |
| Engine air filter | 6540940004 |
| Spark plug | 2541590000 |
| Battery | 001982790826 alt 0019828008 |
| Front wiper blades | 2138203604 |
| Thermostat | 2562002000 |
| Cabin air filter | 1668300218 |
Capacities, torques and tune-up values from the factory service manual.
This engine holds 9.0 qt of 0W-20 / 0W-30 / 0W-40 engine oil. The firing order is 1-5-3-6-2-4.
| Automatic Transmission Fluid | MB Sheet 236.17 |
| Automatic Transmission Fluid Capacity | 10.5 qt |
| Engine Coolant | Coolant listed on either MB 325.6 |
| Engine Oil Capacity | 9.0 qt |
| Transfer Case Fluid | MB P/N A 001989780309 |
| Transfer Case Fluid Capacity | 0.73 qt |
| Cylinder Head Instructions | Use new bolts only. |
| Intake Manifold to Engine Bolts | Bolts 1-9: 6.0 ft-lbs |
| Differential Fill Plug | Front: 18.0 ft-lbs; Rear: 37.0 ft-lbs |
| Differential drain Plug | Front: 15.0 ft-lbs; Rear: 37.0 ft-lbs |
| Transfer Case Fill Plug | 10.0 ft-lbs |
| Transfer Case Drain Plug | 18.0 ft-lbs |
| Cylinder Firing Order | 1-5-3-6-2-4 |
| Spark Plug Manufacturer | Mercedes-Benz |
| Spark Plug Gap | 0.028 in |
| Spark Plug Torque | 11.0 ft-lbs |
| Refrigerant | R1234yf |
| Refrigerant Capacity | 1.39 lbs |
| Oil Capacity | 2.80 oz |
| Minimum Pad Thickness | 0.079" in |
| 1 | 37.0 ft. lbs., Step 2: 180° | 37 ft. lbs |
| 1 | 15.0 ft. lbs., Step 2: 15.0 | 15 ft. lbs |
Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.
Showing 2 of 4 campaigns on record for this vehicle.
Mercedes-Benz, LLC (MBUSA) is recalling certain 2021 G550, AMG G63, E350, E450, AMG CLS53, AMG E53, AMG GT43, AMG GT53, AMG GT63, 2021-2022 CLS450, and AMG E63 vehicles. The rear seat belt automatic locking retractors… Remedy: Dealers will inspect, and replace as necessary, the rear seat belt assemblies, free of charge. Owners notified of the voluntary recall campaign by an interim letter on August 13…
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2021 C-Class, E-Class, E-Class Coupe and Convertible, GLC, CLS, AMG GT 4-door Coupe and G-Class vehicles. Please refer to MBUSA's recall report for specific vehicle… Remedy: MBUSA will notify owners, and dealers will replace the seat position switches, free of charge. Owner letters were mailed May 21, 2021. Owners may contact MBUSA customer service at…
The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.
Decode factory build data for a specific vehicle by VIN.
Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.
Cross-vehicle references for the kinds of data on this page.
9.0 qt of 0W-20, 0W-30, 0W-40; Above 23°F: 20W-40, 20W-50; Above 5°F: 15W-30, 15W-40, 15W-50; Above -4°F: 10W-30, 10W-40, 10W-50, 10W-60; Above -13°F: 5W-30, 5W-40, 5W-50. Oil meeting MB Sheet: 229.51, 229.52, 229.61 and 229.71, per the factory manual.
NHTSA lists 4 recall campaign(s) for this model year. Check your specific vehicle by VIN.