Disclaimer:
This post is based on my personal experience and intended for informational and educational purposes only. Procedures, tools, and parts may vary depending on the vehicle and situation. Always consult your service manual or a professional before performing any maintenance.For more information, please read the full disclaimer here.
BMW B47 DPF Regeneration – Real Data
Every few days, I scan my car using the Launch diagnostic tool.
I check the condition of the DPF, turbocharger, and number of regenerations.
My goal is to understand which driving style works best for my car.
Here, I’ll share some interesting DPF data and patterns I’ve observed.
About the Car
- Model: BMW F36 Gran Coupe 420d
- Engine: B47, 140 kW (190 HP), 4-cylinder diesel
- Current mileage: 116,090 km
The last oil change was at 113,100 km – more information about this event you can find at the link.
So far, the oil has been used for 2,071 km.
Diagnostic Data at 115,171 km
DPF Regeneration Counters:
| Type | Count |
|---|---|
| Type 1 – Automatic / Active | 196 |
| Type 4 – Passive Regeneration | 79 (+2) |
| Type 6 – Post-Injection / Secondary Active Regeneration | 133 (+2) |
Other Stats:
- DPF Total Remaining Distance: 148,880 km
- Average Regeneration Interval: 418 km
During this period, I mostly drove at low speeds but in long sessions — for example, 100 km stretches followed by a pause.
Average speed: between 35-50 km/h per drive session
Comparison with Previous Reading at 114,659 km)
At 114,659 km, the regeneration stats were:
- Average Regeneration Interval: 419 km
- Oil usage since change: 1,559 km
| Type | Count |
|---|---|
| Type 1 – Automatic / Active | 196 |
| Type 4 – Passive Regeneration | 77 |
| Type 6 – Post-Injection / Secondary Active Regeneration | 131 |
Between the two readings (a difference of 512 km), I noticed:
- Regeneration Type 1 increased more when I drove mostly on the highway.
- Regeneration Type 4 and Type 6 increased by 2 during low-speed, continuous drives.
DPF Total Remaining Distance Insight
At 114,659 km, the DPF Total Remaining Distance was 149,320 km. At 115,171 km, it decreased to 148,880 km.
This means that over 512 km of driving, the DPF remaining life dropped by:
- 🔻 440 km
The remaining life decreased by approximately 85.9% of the actual distance driven.
The DPF Total Remaining Distance is an estimate of the filter’s lifespan, not the exact distance until failure. A drop of 440 km over 512 km driven suggests the filter wears slightly slower than the distance driven, which is normal due to soot accumulation and regeneration cycles.
Understanding BMW DPF Regeneration Types (B47 Engine)
Notice: This section was generated with the help of AI 🙂
BMW diesel engines like the B47 use different regeneration strategies to clean the Diesel Particulate Filter (DPF). Each regeneration type has a unique purpose depending on driving conditions, DPF saturation level, and engine status.
Here’s a simplified explanation of the Regeneration Counter Types found in diagnostic tools like Launch or ISTA:
Type 1 – Automatic / Active Regeneration
- This is the most common regeneration type.
- Triggered automatically by the ECU during normal driving.
- Happens when the DPF reaches a specific soot level.
- Requires steady driving at speeds above ~60 km/h and engine at operating temperature.
Type 2 – Service / Workshop Regeneration
- Manually triggered during maintenance (via diagnostic tools).
- Used when automatic regeneration is not possible (e.g., sensor fault or excessive soot load).
Type 3 – Emergency / Forced Regeneration
- A last-resort regeneration triggered by the ECU.
- Designed to prevent DPF damage when other types fail.
- Often associated with high exhaust temperatures.
Type 4 – Passive Regeneration
- Happens naturally while driving, without additional fuel injection.
- Requires sustained high exhaust temperatures.
- Common during highway driving or under high engine load.
Type 5 – Unknown / Reserved
- Not officially documented.
- Possibly reserved for internal or special use cases.
Type 6 – Post-Injection / Secondary Active Regeneration
- Another form of active regeneration using post-injection of fuel.
- Typically triggered during low-speed driving.
- Helps raise exhaust temperature when conditions aren’t ideal for Type 1.
Type 7 – Unknown / Rarely Used
- Very rare in real-world diagnostics.
- Purpose not clearly identified.
Type 8 – Unknown
- Not commonly seen.
- May be reserved for future use or specific conditions.
Which Regeneration Type Is Best for the Engine?
Passive regeneration (Type 4) and active regeneration during highway driving (Type 1) are the best for engine and DPF health.
They happen under optimal conditions, with stable temperatures and minimal fuel dilution.
Avoid frequent low-speed regenerations (Type 6) as they can lead to incomplete burns and more oil contamination over time.
DPF Regeneration Summary
Based on my observations and diagnostic readings, here are the key conclusions:
- ⚙️ Driving Strategy: Since I was driving 100% locally and below 100 km/h, I often downshifted on open roads and kept RPM between 2,500–3,000, which likely contributed to more passive regenerations – will try this strategy on highway.
- 🚗 Best Regeneration Types: Passive regeneration (Type 4) and active highway regeneration (Type 1) are healthiest for the engine and DPF.
- 🛣️ Highway Driving: Highway driving at speeds up to 130 km/h, without pushing the engine to high RPMs, seems to increase only the Type 1 regeneration.
- 🏙️ City Driving: Frequent Type 6 regenerations in city traffic may lead to fuel dilution and faster engine wear over time, especially if regenerations remain incomplete.
