Dtomi Engine Radiator Overflow Tank coolant reservoir for BMW (replaces 17137640514) — complete kit with cap & level sensor

Dtomi Engine Radiator Overflow Tank is a direct-fit replacement coolant reservoir assembly (tank, cap, and level sensor) designed to restore proper coolant expansion and recovery for compatible BMW models.

This complete coolant expansion tank kit from Dtomi includes the reservoir, pressure cap, and level sensor so you can replace a failing or cracked tank without sourcing separate components. Manufactured to meet OEM fit and material standards, the unit is molded from durable plastic engineered for repeated thermal cycles. The part replaces several factory numbers (including 17137640514 and 17137567462) and fits a wide range of BMW 1 Series, 3 Series, 4 Series derivatives, X1, and Z4 model years—check the compatibility list below before ordering.

Which BMW models and part numbers does this Dtomi tank replace?

This tank is compatible with numerous BMW chassis and engine variants from mid‑2000s to mid‑2010s. It replaces original equipment part numbers and several aftermarket cross-references so you can match by your vehicle or by the OEM number.

• Replaces OEM numbers such as 17137640514, 17137567462, 17137543026, 17137607482 and 1.603-334.
• Other cross-references include 376789751 and EPT0028.
• Fits many BMW models: 1 Series (including 128i, 135i), 3 Series E90/E91/E92/E93 (323i, 325i, 328i, 330i, 335i variants), X1 (E84 sDrive and xDrive trims), and Z4 (E89) across listed years and engines.
• Always verify your vehicle’s year, engine code, and OEM part number prior to purchase.

How hard is it to install the Dtomi coolant reservoir myself?

Installation is straightforward for anyone comfortable with basic under‑hood work: drain the small amount of coolant needed, unplug the level sensor, remove mounting fasteners, swap the tank, and reconnect. The kit arrives with the cap and sensor installed or ready to fit, so you won’t need additional parts.

• Includes tank, cap, and level sensor—no separate purchases required.
• Bolts to existing mounting points and reuses hoses where compatible.
• Typical install tools: socket set, pliers, funnel, and safety gloves.
• If unsure, have a technician perform the swap to ensure proper sealing and bleeding.

What materials and performance features should I expect from this replacement tank?

Dtomi builds the reservoir from high‑grade plastic formulated for thermal stability and resistance to coolant additives. The level sensor included is matched to the housing so the vehicle’s warning and gauge circuits function as before.

• Durable plastic construction engineered for repeated heat cycles and pressure changes.
• Factory-style cap to maintain system pressure rating and venting behavior.
• Pre-fitted or included sensor to keep level readings accurate and avoid fault codes.
• Manufactured to fit OEM mounting points for a secure, rattle-free installation.

Will this Dtomi tank work with my vehicle’s cooling system and sensors?

When matched to the correct part number and vehicle model, the reservoir integrates with the existing cooling hoses, fill neck, and sensor wiring. Confirm the cross-reference numbers and physical connector style to ensure compatibility before installation.

• Works with provided sensor connector types used on listed BMW models.
• Designed for OEM-style hose connections and fill cap interface.
• Check your vehicle’s original part number and sensor plug shape to confirm fitment.

Who is this for: This Dtomi Engine Radiator Overflow Tank is intended for BMW owners, DIY mechanics, and independent shops replacing cracked, leaky, or malfunctioning coolant expansion tanks on compatible 1 Series, 3 Series, X1, and Z4 vehicles. Choose this kit if you want a complete replacement (tank, cap, sensor) matched to common OEM numbers and built to fit without modifying mounting points—ideal for restoring cooling system function and preventing coolant loss.