BMW 520d at 217,319 km: DPF cleaning and exhaust-joint work

01 / NHC MOTORS

Mileage alone does not decide replacement

The odometer showed 217,319 km. Deciding whether to clean or replace a used DPF requires looking at its condition, not just its mileage.

We smoke-tested the vehicle and removed the existing DPF. The filter inlet and exhaust connection were inspected during the work.

02 / NHC MOTORS

Cleaning the filter and working on the connection

The DPF was removed for dry and wet cleaning. The photo shows discharge during cleaning.

The flexible exhaust section was removed, replaced and welded. The photos show the old joint, new section and finished welding. The DPF itself was cleaned and reused rather than replaced with a new filter.

03 / NHC MOTORS

24 hPa before cleaning; 12 hPa afterwards

The equipment recorded peak values of 24 hPa before cleaning and 12 hPa afterwards. Both displays were retained as part of the work record.

These are bench readings for the removed filter. Subsequent vehicle monitoring should consider diagnostic values alongside how the car runs.

Peak values on the bench display for the removed filter. These are separate from in-vehicle differential-pressure readings.

04 / NHC MOTORS

Service history matters as mileage increases

Monitoring was agreed after this work. Completing the clean does not end the need to check the car’s condition.

If a DPF concern returns, knowing when cleaning and repairs took place is useful. The saved record helps identify what has changed before repeating work or replacing parts.

Further action will be considered while monitoring symptoms and diagnostic results after cleaning.

Frequently asked questions