New BMW Série 7 Turbo – Ref. 725364-5022S

Symptoms of a failing turbo on a BMW Série 7 730d

On the BMW Série 7 730d fitted with the 3.0 Diesel engine, a turbo nearing the end of its life typically makes itself known through a gradual loss of power under acceleration, an unusual whistling noise from the engine bay, persistent blue or black exhaust smoke, and sometimes an engine warning light accompanied by a fault code related to boost pressure. Excessive oil consumption or an unstable idle can also point to worn bearings or excessive play on the turbo shaft.

Overview of the turbo compatible with reference 725364-5022S

This new turbo is compatible with reference 725364-5022S, designed to fit the BMW Série 7 730d with the 3.0 Diesel engine. It restores the original boost pressure and returns the performance expected from this model, while meeting the technical specifications of the intake and exhaust circuit specific to this saloon.

Engine compatibility and reference verification

This turbo fits the BMW 7 series 3.0D 730d with engine code M57 TU / TU2, also identified as M57 D30 (306D2) M57 D30 (306D3) depending on the technical source. Before placing an order, it is strongly recommended to check the exact reference marked on the old turbo, as several variants may have been fitted to this model depending on the production period.

Equivalent references

• 725364-5022S

Exchange basis and warranty for this BMW Série 7 turbo

This turbo is sold on an exchange basis: return of the old turbo is required, in accordance with the Terms and Conditions. It is only collected after the new turbo has been delivered and fitted, so that the BMW Série 7 is not left off the road during the process. The new turbo comes with a 12-month parts warranty, subject to fitting by a qualified professional.

Fitting advice for the 730d engine

Before installation, check the condition of the oil circuit, the cleanliness of the oil feed and return hoses, and the condition of the air intake and intercooler — these are frequently implicated in premature failures on this 3.0 Diesel engine. A full oil change using a suitable quality oil and a new air filter are recommended before refitting. When starting the engine for the first time, priming the turbo with oil prevents it from running dry on start-up, which protects the service life of the new part.

Payment for this turbo can be spread over several instalments, in up to 10 instalments, subject to the payment options available.