2025 Mercedes C 300: check the fuel tank and staggered tires before assuming a standard size.
How large is the 2025 US Mercedes C 300 fuel tank, and what are its factory reference tires?
For the 2025 US rear-wheel-drive C 300 Sedan, Mercedes-Benz lists a 17.4-US-gallon fuel tank, 25/35 city/highway mpg and 225/45R18 front with 245/40R18 rear reference tires. This reference is not an AMG model or C 300 4MATIC fitment chart.
Applicable to: 2025 US Mercedes-Benz C 300 Sedan, standard rear-wheel-drive 2.0L mild hybrid; not AMG C 43/C 63, 4MATIC, wagon, coupe or another year.
Manufacturer-specified figures by configuration
These are manufacturer-referenced values for the named configurations only. Read the exact source for your engine, trim and market instead of carrying a measurement across model names or model years.
| Vehicle configuration | Published value | Context and limits | Manufacturer evidence |
|---|---|---|---|
| C 300 RWD · nominal fuel tank | 17.4 US gal | Mercedes-Benz 2025 C 300 model comparison, 2.0L turbo mild-hybrid; premium unleaded | View original source ↗ |
| C 300 RWD · EPA city/highway | 25 / 35 mpg | 2025 US city and highway published ratings, not a guaranteed driving range | View original source ↗ |
| C 300 RWD · front reference tire | 225/45R18 | Staggered manufacturer reference; 18×7.5 in front wheel | View original source ↗ |
| C 300 RWD · rear reference tire | 245/40R18 | Staggered manufacturer reference; 18×8.5 in rear wheel | View original source ↗ |
| C 300 RWD · engine and gearbox | 255 hp / 9-speed | 2.0L mild-hybrid inline-four; 9G-TRONIC automatic; 295 lb-ft | View original source ↗ |
Match the exact vehicle.
Check 1
Confirm US 2025 C 300 rear-wheel-drive Sedan; AMG cars and optional wheel packages may use different equipment.
Check 2
A factory tire-size example is not a replacement for your fitted tire placard or permission to rotate staggered wheels front-to-rear. Verify the actual wheel option before ordering.
Check 3
The 17.4-gallon figure is nominal tank capacity, not an instruction for refilling the entire tank or a promised practical range. No oil or transmission-fluid service fill is provided.
Where the numbers came from
Mercedes-Benz USA's model-year-coded 2025 C 300 Sedan official compare-vehicles entry: Engine, Fuel Economy and Wheels/Tires sections. The page's rear-drive configuration is held separate from 4MATIC and AMG options.
Primary evidence (1 source)
- Manufacturer source 1mbusa.com ↗
5 exact configuration rows supported
This page is an original explanation of limited factual specifications. CarFactBook has not inferred an exact VIN, fitted replacement part, global-equivalent manual or unpublished service quantity.
Source count: 1. The original manufacturer's vehicle-specific manual and labels take priority if your exact car differs from these listed reference configurations.
Return to manufacturer research → · Browse the verified vehicle catalog →
Mercedes-Benz C 300 W206: oil approval, service and staggered fitment
Scope: 2025 US C 300 Sedan, rear-wheel-drive. A Mercedes global operating-fluid approval sheet is not independently proof that every US C 300 engine or AMG variant uses that particular fluid.
This C 300 reference has unequal factory front and rear tyre sizes. Wheel replacement and maintenance must distinguish the installed option and correct rear-drive configuration.
| Owner question | Evidence or status | Exact applicability | Original source |
|---|---|---|---|
| 2025 US C 300 oil with filter | VIN/manual confirmation required VIN / exact-edition manual required | Do not reuse older C 300 or AMG quantities; editions and drivetrains differ | Mercedes-Benz official owner's manuals ↗ |
| MB 229.71 approval reference | Approved low-SAPS 0W-20 product list | Manufacturer operating-fluids approval list. The exact 2025 C 300 manual must first authorize this specification | Mercedes-Benz operating fluids sheet 229.71 ↗ |
| Brakes and tire replacement | Use installed front/rear wheel option VIN / exact-edition manual required | Original comparison shows staggered 225/45R18 front and 245/40R18 rear reference sizes; optional wheels differ | Mercedes-Benz official C 300 manual selector ↗ |
What to check at your next service
Use vehicle-specific service items, not a universal C-Class number
Identify the exact 2025 owner and service/warranty booklets before choosing an oil grade, fill quantity, brake-fluid interval or reset procedure. Mercedes publishes the documents by model and edition.
Check specification approval separately from viscosity
An SAE viscosity label alone does not establish Mercedes-Benz approval. Cross-check the approved product sheet only after the relevant C 300 manual confirms which MB-Approval applies.
Separate a warning from a diagnosis
A warning light or symptom is not a verified root cause. Record the exact message, conditions and diagnostic codes. Do not continue driving with an urgent oil-pressure or overheating warning just to test an assumption.
Engine oil message
Preserve the exact driver-display wording, oil-level reading and vehicle conditions. Low level, overfill and oil-pressure alerts require different responses; pressure warnings warrant stopping safely and consulting the manual immediately.
Service reminder versus fault
Check whether the message is a scheduled service request or a malfunction. Do not reset the indicator before the corresponding work is performed or treat a drivetrain warning as an oil-service instruction.
Confirm parts before purchase
Front and rear tyres are not interchangeable by default
Confirm wheel option, axle, load/speed index and VIN before buying tyres or brake components. The original C 300 research identifies one staggered factory reference, not the configuration of every delivered car.
Evidence boundary: No US-2025-specific oil capacity, drain-plug torque, filter SKU, automatic transmission drain quantity or fault-code cure has been approved for publication.