SKU: PI-1186 | UPC: 847839000760
Koyo Radiator Drain Plug for BMW 3 Series E36 1992-1999 and 5 Series E39 1997-2003 PI-1186
The Koyo Radiator Drain Plug PI-1186 replaces fragile OEM plastic plugs in BMW E36 3 Series 1992-1999 and E39 5 Series 1997-2003 models including Z3 variants. Built from billet aluminum this plug endures extreme track pressures and heat while enabling fast mess-free coolant drains during maintenance. Its robust construction ensures radiator integrity for street driving or racing demands.
Key Features
- Billet Aluminum Construction: Resists corrosion and cracking far better than stock plastic for long-term radiator protection
- M14x1.5 Thread Pitch: Ensures precise fit into factory radiator ports without modifications
- Viton O-Ring Seal: Provides a tight leak-proof barrier against coolant loss even under vibration
- Quarter-Turn Design: Allows fast partial or full draining without tools for convenient service intervals
- Performance Engineered: Handles demands of modified engines and racing conditions with consistent reliability
Product Notes
- Direct bolt-on replacement for OEM part numbers on specified BMW models
- Compatible with all coolant types including water wetter mixes
- Compact design ships in protective packaging to prevent damage
Installation Notes
- Professional installation recommended.
- Drain existing coolant fully before removing old plug to avoid spills
- Torque to 8-10 Nm using OEM radiator hardware no additional parts needed
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1992-1995 | BMW | 3 Series | 318i E36 |
| 1992-1995 | BMW | 3 Series | 318is E36 |
| 1995-1999 | BMW | 3 Series | 318ti E36 |
| 1992-1999 | BMW | 3 Series | 325i E36 |
| 1992-1999 | BMW | 3 Series | 325is E36 |
| 1995-1999 | BMW | 3 Series | M3 E36 |
| 1996-1999 | BMW | 3 Series | 328i E36 |
| 1996-1999 | BMW | 3 Series | 328is E36 |
| 1997-2002 | BMW | Z3 | All E36/7 E36/8 |
| 1997-2003 | BMW | 5 Series | 528i E39 |
| 1998-2003 | BMW | 5 Series | 540i E39 |
| 1998-2003 | BMW | 5 Series | M5 E39 |
Why Choose Koyo?
- Decades of motorsport experience in cooling components
- CNC machined from aerospace-grade aluminum
- Proven in BMW racing applications worldwide
Frequently Asked Questions
- Q: Will PI-1186 fit my 1996 BMW E36 328i?
A: Yes it directly replaces the factory drain plug on all E36 328i models from 1996-1999 with M14x1.5 radiator ports - Q: What material is the seal made from?
A: High-temperature Viton O-ring resists degradation from coolant additives and heat up to 400F - Q: Is there a warranty on this drain plug?
A: Backed by Koyo 1-year limited warranty against manufacturing defects when installed correctly
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock – ships same or next business day
- Packaging: Protective padded envelope 4 x 3 x 1 inches
- Weight: 0.10 lbs
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