For most 2020 Freightliner M2 trucks, the driver’s-side wiper blade is 28 inches and the passenger-side blade is 20 inches. Exact sizes can vary by cab and windshield configuration, so always verify on your specific vehicle before purchasing replacements.
Understanding the M2 windshield wiper setup
The Freightliner M2 uses dual, swept wiper blades to cover a large, curved windshield. Depending on the body style (cab height, hood length, windscreen shape) the passenger-side blade might be shorter than the driver-side blade. The typical two-blade pairing is 28 inches on the driver’s side and 20 inches on the passenger side, though some configurations may use 28"/18" or other variations.
Common blade sizes for 2020 Freightliner M2
Driver-side blade
Typically 28 inches. This blade sweeps the majority of the driver’s side area and is the longer of the two in most configurations.
Passenger-side blade
Typically 20 inches, but some windshields use 18 inches depending on the exact glass curvature and cab configuration.
Alternate configurations
Some cab styles or aftermarket wiper assemblies may pair 28" with 18" or other non-standard sizes. Always confirm the exact pairing for your truck.
While these sizes cover the majority of 2020 M2 configurations, always verify your exact sizes on the vehicle before purchasing replacements.
How to verify the exact blade sizes for your 2020 Freightliner M2
Use these steps to confirm the correct blade lengths for your truck so you order the right replacements the first time.
- Check the owner’s manual or Freightliner’s official parts portal for blade-size information by model and VIN.
- Inspect the current blades for size markings; many blades have their length printed on the blade itself or packaging.
- Remove a blade and measure its length from tip to base when laid flat along a ruler or tape measure, accounting for any curve.
- Ask a Freightliner dealer or trusted aftermarket parts retailer to verify your blade pairing by providing your VIN or cab/body type.
Once you know the exact sizes, you can confidently order a 28" driver-side blade and a 20" passenger-side blade for most configurations, or adjust to 28"/18" if your windshield calls for it.
Replacement tips and blade options
Choose high-quality, weather-appropriate blades and ensure the mounting system matches your wiper arms (J-hook, pin, or other adapters). Consider climate and seasonality when selecting blades, as winter blades can offer better performance in freezing conditions. Brands like Bosch, Rain-X, and Valeo offer 28" and 20" lengths that fit many heavy-duty trucks; always verify compatibility with the M2's wiper arms.
- Weather considerations: all-season blades vs winter blades.
- Mount compatibility: ensure the blade attaches correctly to your wiper arm (J-hook, pin, or adapter).
- Carry spares of the most common sizes (28" and 20") for quick replacements.
To replace, lift the wiper arm, release the blade by pressing the tab or lock mechanism, slide the new blade into place until it clicks, and test the sweep to ensure full coverage without streaking.
Summary
The typical replacement pairing for a 2020 Freightliner M2 is 28 inches on the driver’s side and 20 inches on the passenger side, but variations exist with different windshields and cab configurations. Always verify exact sizes via the VIN, manual, or parts retailer before purchase, and follow proper installation steps to ensure optimal performance in all weather conditions.
In short: measure or verify, then replace with the correct 28" and 20" (or adjusted 28"/18" if required) blades, and test the sweep to ensure clear visibility.