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Details
| Specification | Value |
|---|---|
| Brand | MAHLE |
| MPN | 081pi00126000 |
| Length [mm] | 51.2 mm |
| Cylinder Bore [mm] | 82.0 mm |
| Bolt Head Diameter [mm] | 22 mm |
| Component Number | 2. NM 1.5 P |
| Component Number | 3. 3S 2 N |
| Component Number | 1. R 1.2 N |
| Production Number | 82L177 |
| Compression Height [mm] | 33.2 mm |
| Recess Diameter [mm] | 62 mm |
| Bolt Length [mm] | 55 mm |
| Recess Depth 1 [mm] | 3.57 mm |
| Top Land Height [mm] | 7 mm |
| Valve Pocket Depth 1 [mm] | 4.79 mm |
| Valve Pocket Depth 2 [mm] | 4.37 mm |
OE numbers (2)
Search by this OE number to find compatible parts
- BMW—11 25 8 638 450
- BMW—8638450
Where this part fits
Original-fit position for OE 11258638450.
What's in the kit
This kit ships with 1 factory-matched components. Each part below is supplied as part of the kit; click any linked MPN to view that component on its own.
| # | Part number | Component | Qty |
|---|---|---|---|
| 2 | 081 RS 00125 0N0 | Piston Ring Kit
| 1 |
About this product
The MAHLE Piston (081 PI 00126 000) is a professional-grade replacement component engineered for long service life and reliable operation across all conditions your vehicle encounters. The part is built to the following specification: Length [mm]: 51, Aluminium mm, Cylinder Bore [mm]: 82, 0 mm, Surface: 117, Bolt Head Diameter [mm]: 22 mm, Component Number: 2. NM 1.5 P. Each dimension is checked against the OEM reference to ensure the component seats and functions correctly first time. Verified to fit BMW, BMW (BRILLIANCE), MINI, MORGAN and 1 other makes models. All compatibility data is cross-checked against the TecDoc database — select your vehicle to confirm the part matches your specific engine and year. This part supersedes original equipment references: 11 25 8 638 450, 42 100 600, 8638450. Matching these numbers confirms a like-for-like replacement with no loss of function. MAHLE is a recognised supplier of automotive replacement components to independent workshops and dealer networks across Europe. All parts are sourced from authorised distribution channels and carry full manufacturer traceability — you receive exactly the same component supplied to professional garages and dealer workshops. If fitment or specifications do not match your vehicle, our technical team can help identify the correct alternative — use the vehicle selector or contact us with your VIN for a guaranteed-fit recommendation. Replacing worn components on schedule preserves your vehicle's safety, reliability, and resale value — and aftermarket parts from established brands deliver OEM-equivalent performance at a fraction of the dealer price. Every part is dispatched with tracked delivery and a 14-day money-back guarantee with hassle-free returns.
About MAHLE
MAHLE, founded in 1920 in Stuttgart, Germany, is a global leader in engine components and filtration systems. MAHLE specialises in pistons, cylinder liners, gaskets, turbocharger components, oil filters, air filters, and fuel filters. As an OE supplier to nearly every car and truck manufacturer worldwide, MAHLE products are engineered to exact factory specifications. Trusted by professional workshops and racing teams alike, MAHLE delivers outstanding engine performance and filtration efficiency across millions of applications.
Suitable cars
Equivalent products (1)
Piston MAHLE 081 PI 00126 000 — compatible car models
| Car models | BMW: 1 (F20), 1 (F21), 1 (F40), 1 Van (F20), 2 Active Tourer (F45), 2 Convertible (F23), 2 Coupe (F22, F87), 2 Coupe (G42, G87), 2 Gran Coupe (F44), 3 (F30, F80) (+20 more) |
|---|---|
| Engines | 120 i; 220 i Flex; 218 i; 220 i; 228 i; 320 i; 318 i; 330 i; 420 i; 520 E PLUG-IN-HYBRID; 520 i Mild-Hybrid; 520 i; 630 i; 730 i; sDrive 20 i |
| Year of manufacture | 2011-2023 |
| Manufacturer article number (MPN) | 081 PI 00126 000 |
| OE part numbers | 11 25 8 638 450, 8638450 |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
MAHLE 081pi00126000 . Bolt Head Diameter [mm]: 22 mm. Bolt Length [mm]: 55 mm. Component Number: 1. R 1.2 N. Component Number: 2. NM 1.5 P. Component Number: 3. 3S 2 N. Compression Height [mm]: 33,2 mm. Cylinder Bore [mm]: 82,0 mm. Length [mm]: 51,2 mm
- 1x Piston
Shipping, returns, warranty
Free UK delivery on orders over £99.00. Tracked standard shipping.
- Standard delivery: 5–9 business days
- Order before 5pm — ships the next working day
- Free returns within 14 days
- All parts backed by manufacturer warranty
Warranty: 12-month manufacturer warranty on all parts. 14-day money-back guarantee if the part doesn't fit your vehicle.
Frequently Asked Questions
Is this Piston compatible with my car?
This Piston fits BMW, BMW (BRILLIANCE), MINI, MORGAN, TOYOTA vehicles. Use the vehicle selector at the top of the page to check exact compatibility — enter your car's make, model, and engine for a confirmed fitment match. All fitment data is verified through TecDoc.
What specifications does this MAHLE Piston have?
This MAHLE Piston has the following specifications: Length [mm]: 51,2 mm; Cylinder Bore [mm]: 82,0 mm; Surface: 117; Bolt Head Diameter [mm]: 22 mm; Component Number: 2. NM 1.5 P; Component Number: 3. 3S 2 N. Check the full specifications table above for complete details.
What OE part numbers does this Piston replace?
This Piston replaces OE part numbers: 11 25 8 638 450, 8638450. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Piston cost?
This MAHLE Piston is available for £97.99. Piston prices vary depending on brand, specifications, and vehicle compatibility. MAHLE parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my Piston?
Regular inspection of your Piston is recommended as part of routine vehicle maintenance. Watch for changes in performance, unusual noises, or visual signs of wear. Consult your vehicle's owner manual for manufacturer-recommended replacement intervals specific to your make and model.
What tools do I need to replace a Piston?
Tools required vary by vehicle make and model. Generally, a basic socket set, screwdrivers, and vehicle-specific tools may be needed. We recommend consulting a workshop manual for your specific vehicle, or having the Piston fitted by a professional mechanic.
Can I use this part as a replacement for OE 11 25 8 638 450?
Yes, this MAHLE Piston is a direct replacement for OE part number 11 25 8 638 450. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
Is the MAHLE 081 PI 00126 000 the same as the MAHLE 001 76 01?
No, while both are Piston parts, they are different products. The MAHLE 081 PI 00126 000 has Length [mm]: 51,2 mm, Cylinder Bore [mm]: 82,0 mm, Surface: 117. The MAHLE 001 76 01 may differ in dimensions, fitting position, or material composition. Always verify compatibility with your specific vehicle using our vehicle selector, or contact our customer service team for assistance.
Related categories
Common OE numbers for this part
Common original equipment numbers linked to stocked alternatives.
