Our coolant overflow bottles are some of the highest quality replacements on the market!

This radiator coolant overflow tank has been designed to replace the original design.


  • Direct replacement for originals that are cracked or broken
  • Replaces dealer part numbers: 17 11 1 712 835, 17111712835
  • Strengthened and redesigned in the vulnerable areas of failure
  • Plastic construction
  • Commonly called Expansion Tank by BMW
  • Fits E30, E34, E36, & Z3 body chassis as listed
  • Does not include cap or coolant lever sensor
  • Buyer will need to reuse original cap & Sensor

Now you can buy a high quality coolant reservoir that is built to strict quality control standards. REPLACE your broken or cracked one now with this great fitting Radiator Overflow Bottle.

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser. Please keep your invoice for proof of this warranty.

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Vehicle Fit

  • 1992-1998 BMW 318i E36 Radiator Coolant Overflow Tank
  • 1991-1992 BMW 318iC E30 Radiator Coolant Overflow Tank
  • 1994-1997 BMW 318iC E36 Radiator Coolant Overflow Tank
  • 1992-1997 BMW 318iS E30 Radiator Coolant Overflow Tank
  • 1995-1999 BMW 318ti E36 Radiator Coolant Overflow Tank
  • 1989-1995 BMW 525i Radiator Coolant Overflow Tank
  • 1993-1995 BMW 525iT Radiator Coolant Overflow Tank
  • 1996-1998 BMW Z3 Radiator Coolant Overflow Tank L4 1.9L

This part replaces:

  • OE # 17111712835
Only 1 left in stock
Part #: 1AROB00025