Product Overview

The oil cooler seal gasket, OEM number 11428637820, is fitted across a wide range of BMW models sharing the N20, N51, N52, N54, and N55 engine family, including the 1 Series (128i, 135i), 2 Series (228i), 3 Series (325i, 328i, 335i), 4 Series (428i), 5 Series (525i, 528i, 535i), 6 Series (640i), 7 Series (740i), X1, X3, X4, X5, X6, and Z4. It's typically sold alongside the related oil filter housing gasket (11428637821) as a matched set, since both are commonly replaced together during an oil filter housing service. Since this gasket spans an exceptionally wide range of BMW models built between 2006 and 2021, it's a high-turnover part number worth stocking in significant volume.

A worn or leaking oil cooler seal typically shows up as visible oil leaks near the oil cooler, low engine oil level, or oil and coolant mixing if the seal fails internally. GSK Auto manufactures this seal to OEM specification at our Ningbo, China facility, with every unit tested before packing. We supply at wholesale volume with low MOQ and support private label packaging, with our team available to confirm fitment before shipping.

Replacement OEM Numbers

Cross-Reference OEM Number

11-42-8-637-820, 11-42-7-525-335, 11427525335, Mahle GS33747

(Confirm against your VIN or chassis code before ordering — these are commonly listed cross-references for this application, not a guarantee of exact fitment for every variant.)

What Is an Oil Cooler Seal Gasket?

Function: The oil cooler seal gasket seals the connection between the oil filter housing and the oil cooler, preventing oil from leaking at this junction.

Working Principle: The gasket compresses between the housing and cooler, creating a sealed barrier that keeps pressurized engine oil contained as it flows through the cooling circuit.

Importance: On BMW's widely used turbocharged inline-6 and 4-cylinder engine platforms, a properly sealed oil cooler gasket is essential for preventing oil leaks and maintaining correct oil pressure.

Common Failures & Signs: Visible oil leaks near the oil cooler or filter housing. Oil residue or staining around the front of the engine. Low engine oil level from a slow leak. Oil and coolant mixing internally if the seal fails.

Key Features

OEM-standard fitment - matches factory dimensions and material specification for the 11428637820 application.

Durable gasket material - built to withstand sustained heat and oil pressure.

Excellent fitment - direct replacement, no modification required.

Tested before shipment - every unit checked before packing.

Reliable performance - restores factory sealing and prevents oil leaks.

Benefits

Importers - covers oil cooler seal demand across an exceptionally wide range of BMW models from one part number.

Wholesalers - very high turnover given the breadth of BMW's N20/N51/N52/N54/N55 engine platform, often paired with the related housing gasket.

Repair Shops - tested unit reduces comeback risk on a common oil leak repair.

Distributors - private label packaging available for building a branded catalog.

End Customers - restored sealing and elimination of oil leaks.

Packaging & Shipping

Standard export cartons. Customized packaging available for distributor branding. OEM-style and private label printing on request. Container loading handled directly, with mixed-SKU consolidation for smaller orders. Worldwide shipping to Europe, North America, South America, the Middle East, Africa, and Southeast Asia.

Why Choose GSK Auto

GSK Auto manufactures factory-direct, keeping pricing tied to production cost. This seal is built to OEM specification and tested before packing. We support low MOQ, private label packaging, and worldwide shipping, with our technical team available to confirm fitment before you order.

Call to Action

Sourcing oil cooler seal gaskets for BMW's N20, N51, N52, N54, or N55-equipped models? Contact GSK Auto for a wholesale quote, catalog, or OEM/private label cooperation.