BMW Rear Crankshaft Seal – Victor Reinz 81‑20745‑40

BMW Rear Crankshaft Seal – Victor Reinz 81‑20745‑40

The Victor Reinz 81‑20745‑40 crankshaft seal is an OEM‑quality rear main seal designed to prevent engine oil leaks at the crankshaft‑to‑transmission interface. Manufactured to original equipment specifications, it ensures a reliable seal, long service life, and correct oil control under high engine loads.

This seal is widely used across many BMW petrol and diesel engines, particularly E‑series platforms, and features a tension spring for consistent sealing pressure. 

Key features

• Rear crankshaft (rear main) seal
• OEM‑quality Victor Reinz construction
• With tension spring for secure sealing
• Designed to meet BMW OE specifications

Technical specifications

• Inner diameter: 90 mm
• Outer diameter: 110 mm
• Width: 12 mm
• Material: FPM (Viton / fluoride rubber)
• Swirl direction: Left‑hand 

BMW engine compatibility

(engine‑dependent)

• Petrol engines: M10, M20, M30, M40, M42, M44, M50, M52, M54
• Diesel engines: M21, M41, M47, M51, M57 

Typical BMW model applications

• 3 Series: E21, E30, E36, E46
• 5 Series: E12, E28, E34, E39
• 6 Series: E24
• 7 Series: E23, E32, E38
• X Series: X3 E83, X5 E53
• Z Series: Z3, Z4 (E85)

OEM references

• BMW 11 14 2 245 364
• BMW 11 14 1 706 785
• BMW 11 14 2 249 533
• Victor Reinz 81‑20745‑40 

✔ Rear crankshaft seal (not front)
✔ Suitable for petrol & diesel engines listed