Original BMW Windshield Washer Fluid Reservoir for E30 325, 325e, 325i, 318is, and M3 (1984–1993)

For E30 owners chasing a puddle of washer fluid under the car, Original BMW part 61-66-1-370-788 is the windshield washer fluid reservoir that holds and feeds washer fluid on the 1984–1993 BMW 325, 325e, 325es, 325i, 325is, 318is, and M3. BMW calls it the fluid container. It is a plastic tank weighing 388 g. As the plastic ages it can turn brittle and crack, which drains the fluid onto the ground. A leaking tank shows up as a low or empty level soon after a refill, and as a need to top up more often than usual. The reservoir is made in Germany.

Original BMW Parts carry a 24-month parts warranty.

BMW began producing this container in November 1982. It replaces the earlier number 61-66-1-370-789. BMW rates the swap as backward-compatible in connection with the old part, so older E30s that left the factory with 61-66-1-370-789 can take this tank. The same reservoir is also cross-referenced as 89506006001. BMW's parts data spans every E30 engine family, including the M10, M20, M40, M42, and S14, and includes the Cabrio body.

Technical Details

• Manufacturer: BMW (Original BMW)
• Part number: 61-66-1-370-788
• BMW designation: fluid container (windshield washer reservoir)
• Replaces: 61-66-1-370-789
• Additional reference: 89506006001
• Weight: 388 g (0.9 lb)
• Production start: November 1982
• Country of manufacture: Germany
• Sold as: one reservoir
• Warranty: 24 months

Common Questions

How do I know my washer reservoir is cracked?
Look for fluid leaking under the car, a level that drops to empty soon after refilling, or a need to refill far more often than normal.

Will this replace the earlier reservoir number?
Yes. It supersedes 61-66-1-370-789, and BMW rates it as backward-compatible in connection with the old part.

Is this a reproduction?
No. It is a genuine BMW part made in Germany.

Fitment & Compatibility

Confirm your model year and submodel against the table below before ordering. PMB Performance has spent over 20 years matching parts to vehicles and can verify this against your VIN.