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What the 2721800510 Assembly Is

The Oil Filter Housing With Oil Cooler 2721800510 is a direct-fit lubrication and thermal-management assembly for Mercedes-Benz M272 V6 and M273 V8 engines. The Koeep product page fits it to the CL550, R350 and S550, and it replaces the factory PA66-GF30 composite housing, the documented weak point on these platforms.

The short version of the spec sheet:

• Material: A380.0 die-cast aluminum, cast to ASTM B85-2025
• Tensile yield strength: ≥160 MPa, about 3.2× the cyclic-fatigue resistance of the OEM glass-reinforced nylon
• Thermal expansion: ±23 μm/m·K, matched to the aluminum cooler
• Service life: 100,000–120,000 miles at 7,500-mile oil changes

Assembled weight with the cooler rises from about 1.85 kg to 2.40 kg, the trade for removing the failure mode described next.

Why the Factory Housing Fails

The OEM housing is PA66-GF30, a 30% glass-fiber-reinforced polyamide 66. Its failure mode is differential thermal expansion. Aluminum moves at about ±23 μm/m·K, the polymer at about ±60 μm/m·K. At the M272/M273 normal oil-sump temperature of 105°C to 125°C, that mismatch loads the gasket plane with cyclic shear stress on every heat cycle.

After roughly 60,000–80,000 miles this shows up as oil seepage at the housing-to-block interface. In severe cases, the integrated heat exchanger lets oil and coolant cross-contaminate internally.

The aluminum body also rejects 38% more heat through the housing itself, working as a secondary radiator surface, and it shrugs off the chemical attack that modern low-SAPS 0W-30 / 5W-40 synthetic oils can inflict on PA66 during long drain intervals.

Sealing: Viton Instead of HNBR

All three sealing planes carry pre-installed Viton® fluoroelastomer O-rings: housing-to-block, oil-cooler-to-housing, and the oil-filter cap seat. Viton covers −20°C to +220°C and holds compression set below 15% after 1,000 hours at 150°C per ASTM D395 Method B. The OEM seals are HNBR.

Spec Matrix: OEM Plastic vs Koeep Aluminum

Fitment

Direct fit for 2005–2014 models on M272 2.5L to 3.5L V6 and M273 4.7L to 5.5L V8 engines:

• CL550 (C216), R350 (W251), S550 (W221)
• C300 / C350 (W204), E350 (W211 / W212)
• ML350 (W164), GLK350 (X204)
• SLK350 (R171 / R172), CLK350 (C209), G550 (W463)

The OE pressure-sensor port and cooler circuit carry over, so the assembly stays compatible with the ME 9.7 / MED 17 engine management architecture and CAN-bus 3.0 high-speed networks at 500 kbps. Oil-pressure and oil-temperature data streams continue uninterrupted after installation. If anything about your build is unclear, send the engine code and VIN through the RFQ page before you order.

Fault Codes the Old Housing Causes

P0016, P0017 and P0018 are cam/crank correlation faults. Internal bypass leakage destabilizes oil pressure, so the camshaft adjusters miss their commanded positions inside the ECU window, which is under 2.0 seconds at 1,200 RPM.

P0521 through P0523 cover the oil-pressure sensor. The precision-machined port on the aluminum housing stops the galling and thread deformation that the plastic port develops, so a Bosch sensor keeps its calibrated output range.

P06DA through P06DD, defined under SAE J2012-2025 for oil-solenoid monitoring, trace back to debris from a disintegrating PA66 housing clogging the oil-control solenoid screens. P0400 through P0499 EGR-range codes come from oil contamination of the intake tract via PCV reversion through a leaking housing. The sealed internal galleries on the aluminum unit end both chains.

What Ships in the Kit

• 3× Viton® housing-to-block O-rings, large rectangular profile, color-coded for orientation
• 2× oil-cooler mounting bolts, M8 × 1.25, grade 10.9, factory-coated with anti-seize
• 1× oil-filter cap, 27mm hex drive, with integrated bypass valve
• 1× oil-pressure sensor crush washer, annealed copper, 14mm ID
• Torque card with 2026-updated values per Mercedes WIS document AR01.30-P-5700MRV

The sensor itself is a separate part: OE-spec Bosch 0261230125, torqued to 18 N·m. If P0522 survives a new sensor, the housing is the root cause.

Filters That Fit the M27 × 1.5 Thread

• Mann-Filter HU 718/5 x: OE supplier, multi-layer cellulose/synthetic media, 99.9% efficiency at 25 microns per ISO 4548:2025
• Hengst E827H D220: fleece media with 35% more dirt-holding capacity than OE cellulose, suited to extended 10,000-mile intervals
• Mahle/Knecht OX 379D: silicone anti-drainback valve, the pick for cold climates at −20°C and below
• Bosch F 026 407 131: premium aftermarket, 20-micron absolute filtration rating

One rule applies to all of them: bypass cracking pressure must sit at 2.5 ±0.3 bar. Filters with lower thresholds let unfiltered oil circulate and accelerate housing-internal erosion. Koeep projects the 100,000–120,000-mile service life (8–10 years) with HU 718/5 x or E827H filters on 7,500-mile changes.

More Mercedes Parts While You Are Ordering

Koeep covers more than cooling and lubrication. On a W203 C-Class, the spiral cable clock spring A2095400145 is the part behind dead horn and steering-wheel control faults on that chassis. GLS550 owners can add the 2017–2019 GLS550 OEM floor mat set, three pieces in brown Designo, to the same shipment.

Everything else lives in the auto and motorcycle parts collection. If you also service small engines, the ECCPP starter guide for Kohler 2409801 and 2509808 covers 2026 cross-reference and installation steps in the same plain format.

Verification and OEM Cross-Reference

Koeep lists the assembly under SKU KOE-MB-2721800510-AL. Castings come from an ISO 9001:2015 / IATF 16949:2026 certified facility, get CMM-checked to ±0.05mm against the Mercedes OEM drawing A2721800510, and the cooler core is vacuum-brazed under ISO 18279:2025 procedures with heat-lot traceability per SAE J1857 Annex C.

Koeep holds ISO 14001:2025 certification across the product lifecycle, including a closed-loop aluminum recycling program for end-of-life housings. Market note: the 2026 Automotive Oil Filter Market Report (Fortune Business Insights, March 2026) counts an estimated 2.4 million M272/M273 vehicles still active worldwide, with aftermarket demand projected through 2034.

These numbers map to the same housing:

• Mercedes-Benz: A2721800510, A2721800410, 2721800510, 2721800410
• Vemo: V20-10-0017 • AKS DASIS: 046023N • Nissens: 90768 • NRF: 31730
• VAN Wezel: 37013710 • Topran: 409 387 • Meyle: 100 272 0008

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