Mercedes Sprinter Rear Differential Pinion Seal – Corteco | All Generations | #0159970346 (2001+)

A leaking rear differential pinion seal on a Mercedes Sprinter allows gear oil to escape along the pinion shaft at the driveshaft connection point — creating a gear oil leak that contaminates the driveshaft, accumulates on the undercarriage, and progressively starves the differential of the lubrication its ring and pinion gears require. This is the Corteco rear differential pinion seal for Mercedes-Benz Sprinter vans across all generations, a direct replacement that restores a leak-free seal at the differential pinion output.

What This Part Does

The pinion seal is a radial shaft seal that presses into the differential housing at the pinion bearing carrier and contacts the rotating pinion flange or yoke as it spins. It maintains a dynamic oil seal that prevents differential gear oil from escaping along the pinion shaft axis despite the shaft's continuous rotation and the differential housing's internal oil pressure from splashing and churning gears. The seal must maintain lip contact with the pinion shaft surface across a wide range of temperatures and rotation speeds while resisting the chemical degradation of gear oil over its service life. When the seal's lip wears, hardens, or loses its contact pressure from age, oil begins to seep past the lip and track down the driveshaft toward the flex disc and transmission.

Common Symptoms of a Failing Pinion Seal

• Gear oil dripping or accumulating at the front of the rear differential housing
• Oil residue on the driveshaft between the differential and the flex disc
• Differential gear oil level dropping between service intervals
• Gear oil smell from the undercarriage during or after driving

When to Replace

Replace any time the pinion flange is removed for any reason — driveshaft service, pinion bearing replacement, or differential seal inspection. The seal is always replaced as part of pinion flange removal, as reinstalling a used seal on a freshly torqued flange creates an immediate repeat leak. Always replace the pinion nut (9069900253) at the same service.

Fitment

• 2001–2006 Mercedes-Benz / Dodge Sprinter (T1N) – All models
• 2007–2018 Mercedes-Benz / Dodge / Freightliner Sprinter (NCV3) – All models
• 2019+ Mercedes-Benz Sprinter (VS30) – All models

✔ Always replace pinion nut (9069900253) at the same service
✔ Always verify by VIN — pinion seal dimensions may vary by rear axle specification

Part Numbers

• Mercedes OEM: 0159970346 / A0159970346 / 015-997-03-46
• Cross-reference: A015997034664
• Manufacturer: Corteco — 82035893 / 01035893B
• SKU: 0159970346