Dorman OE Solutions Engine Coolant Reservoir for 2018 Mercedes-Benz with Pressurized Design 603-257

Pressurized coolant reservoir for 2018 Mercedes-Benz models used to replace cracked or leaking factory expansion tanks.

Built to meet the manufacturer's design intent for reliable service, this unit is constructed from quality materials engineered to withstand underhood heat and engine vibration while matching the original part's fit and function.

Key Features

• Direct replacement for specific Mercedes-Benz OEM part numbers
• Constructed from durable materials resistant to thermal stress
• Engineered to match original equipment form and fit
• Pressurized design maintains proper cooling system operation
• Validated through testing for daily driving demands

Benefits

• Restores cooling system integrity to prevent overheating
• Eliminates leaks caused by cracked or failed factory tanks
• Ensures a smooth installation with no modification required
• Reduces the risk of repeat repairs with robust construction
• Provides a trustworthy solution backed by decades of experience

Application

Ideal for Mercedes-Benz owners experiencing coolant loss or visible damage to the original expansion tank who need a dependable direct-fit replacement.

Fitment Notes

• Designed for select 2018 Mercedes-Benz vehicles
• Verify compatibility using part number 603-257 before purchase

Why Choose Dorman - OE Solutions?

• Dorman parts are engineered as direct-fit replacements designed to match OE form, fit, and function
• Built with quality materials and validated through testing to stand up to daily driving demands
• Offers a smart way to restore your vehicle with confidence in fit and durability

What's in the Box

• 1 Engine Coolant Reservoir

Item Dimensions

• 11.9in x 10.1in x 6.9in, 2.3lbs