Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2021 GLC300.
The 2021 Mercedes-Benz GLC300 sits within the model's compact luxury SUV lineage, and its service-side specifications — a 6.3-quart engine oil capacity paired with manufacturer-approved viscosities of 0W-20, 0W-30, and 0W-40 — offer a concrete technical entry point for researchers. The breadth of approved oil weights is itself a standout detail, signaling flexibility across climates and duty cycles while preserving factory service requirements. As a 2021 model year, the GLC300 contributes a defined data point to the nameplate's maintenance and reliability record, with these fluid specifications serving as a baseline reference for long-term service planning.
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 2701800109. 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 | 2701800109 |
| Engine air filter | 2640940100 |
| Spark plug | 0001590500 |
| Battery | 0019828008 |
| Front wiper blades | 2058204503 |
| Thermostat | 2642003901 |
| Cabin air filter | 1668300218 |
Capacities, torques and tune-up values from the factory service manual.
This engine holds 6.3 qt of 0W-20 / 0W-30 / 0W-40 engine oil, Rear: 183 mm; Rear: 200 mm in the differential, DOT 4 brake fluid. Torque the oil drain plug to Use a new seal: 30.0 ft-lbs. The firing order is 1-3-4-2.
| Automatic Transmission Fluid | MB Sheet 236.17 |
| Automatic Transmission Fluid Capacity | 10.5 qt |
| Brake Fluid | DOT 4 |
| Brake Fluid | DOT 4 |
| Differential Gear Oil | Rear: 183 mm; Rear: 200 mm |
| Engine Coolant | Coolant listed on either MB 325.6 |
| Engine Oil Capacity | 6.3 qt |
| Transfer Case Fluid | Mercedes Benz P/N 001989780309 |
| Crankshaft Pulley and/or Damper Bolts | Step 1 148.0 ft-lbs, Step 2: 180° ft-lbs |
| Cylinder Head Instructions | Use new bolts only. |
| Engine Oil Pan Drain Plug | Use a new seal: 30.0 ft-lbs |
| Engine Oil Pan Drain Plug | Use a new seal: 30.0 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 |
| 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 |
| Transfer Case Fill Plug | 10.0 ft-lbs |
| Transfer Case Drain Plug | 18.0 ft-lbs |
| Cylinder Firing Order | 1-3-4-2 |
| Minimum Pad Thickness | 0.079" in |
| 1 | Bolts 1-10 | 7.4 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 2 campaigns on record for this vehicle.
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…
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2021 GLC 300, GLC 300 4Matic, AMG GLC 63 4Matic, AMG GLC 63 S 4Matic, and AMG GLC 43 4Matic vehicles. The electrical connection for the headlights may not be… Remedy: Dealers will inspect and replace the headlight sealing plugs, as necessary, free of charge. Owner notification letters were mailed June 3, 2022. Owners may contact MBUSA customer…
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.
6.3 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, per the factory manual.
NHTSA lists 2 recall campaign(s) for this model year. Check your specific vehicle by VIN.