Turbocharger BMW X6 (E71 / E72) 40d 306 hp

This category brings together the turbochargers built for engines badged 40d and rated at 306 hp, a pairing that points a buyer straight to the right part before a single reference number is typed into a search box. Independent garages sourcing a same-day replacement, drivers stranded by a loss of power, and owners who prefer to fit the part themselves will find BorgWarner KKK units organized specifically around this engine code and power output, with the exchange-standard process and core return built into every order.

The range is built the way a parts wholesaler builds it: starting from the engine code and horsepower rating rather than a catalogue number, then narrowing to the specific BorgWarner KKK references that fit. That order matters, because most buyers know their vehicle and its symptoms long before they know a part reference. The wholesaler's role is to hold stock, check the OEM equivalence, and manage the consigned core exchange, so a turbocharger moves quickly from an outgoing order to an incoming return.

Professional uses by trade

The 40d, 306 hp turbocharger range is used differently depending on who is ordering it. A garage orders against a job already booked, a stranded driver orders against a symptom, and an enthusiast orders against a project already under way. The list below reflects how each of these buyers actually approaches the category.

• Le garagiste independant : confirms the BorgWarner KKK reference against engine code 40d and the 306 hp rating before booking the exchange-standard turbocharger for a vehicle already on the ramp.
• Le garagiste independant : manages the consigned core return alongside the incoming replacement, keeping the workshop's turnover of exchange-standard units on schedule for waiting customers.
• L'automobiliste depanne : searches by engine code and horsepower after noticing a loss of power, smoke, or a whistling noise, rather than starting from a part number they do not have.
• L'automobiliste depanne : orders the exchange-standard turbocharger toward a workshop of their own choosing, since fitting is arranged separately from the parts order.
• Le passionne qui fait lui-meme : cross-checks the OEM reference and known equivalences against the BorgWarner KKK number before ordering the cartridge for a project already under way.
• Der deutsche Kaeufer (DACH) : matches engine code and power rating to the correct BorgWarner KKK reference, then completes the core deposit return that the exchange-standard process requires.
• Der deutsche Kaeufer (DACH) : relies on the same engine code and power rating used across every market for reference matching, regardless of the language of correspondence.

Range comparison

The 40d, 306 hp category currently holds two BorgWarner KKK references, each sold as a complete exchange-standard turbocharger rather than a bare cartridge, so the comparison below focuses on how each unit is packaged and where it fits in a typical order.

How to choose

Choosing between the two references in this category comes down to matching reference number and engine code, not price or brand preference, since both are BorgWarner KKK exchange-standard units built for the same 40d, 306 hp family.

1. Match the exact BorgWarner KKK reference to the engine code and power rating stamped on the original part before ordering the replacement turbocharger.
2. Confirm the consigned core return process with the wholesaler in advance, since the exchange-standard model depends on sending the worn unit back.
3. Check whether the vehicle uses a variable geometry or a fixed geometry cartridge, since the two mechanisms are not interchangeable within the same engine family.
4. Verify the OEM reference and known equivalences against the BorgWarner KKK number to avoid ordering a part for a similar but distinct engine variant.
5. Consider the reported symptom, loss of power, visible smoke, a whistling noise or limp mode, since it narrows the fault to the turbocharger before ordering.
6. Ask about the warranty terms attached to the exchange-standard unit before ordering, since terms vary by reference and are confirmed at the time of sale.
7. Plan for fitting by a professional workshop of the buyer's choosing, since the reference supplied here is the part itself, not an installation service.

Storage & logistics

Exchange-standard turbochargers in this category are stored boxed and sealed until an order is confirmed, protecting the variable-geometry mechanism and the CHRA from dust and impact during handling. Once a unit ships, the wholesaler expects the worn core back under the same consigned-core terms that apply to the outgoing part, known as Pfand in the DACH market, packaged to avoid further damage to the turbine housing. Garages managing several 40d, 306 hp jobs benefit from tracking each core return against its original order number, since the deposit is only released once the returned unit is confirmed to match the reference shipped.

Since we began working with the 40d, 306 hp family, matching engine code to BorgWarner KKK reference before anything else has kept our exchange-standard process consistent for garages and enthusiasts working on this range.— autoKUR team

Related categories

Browse our other ranges:

• M 4.4 Biturbo 555 hp
• 50i ActiveHybrid 485 hp
• 50ix 408 hp
• m50d 381 hp
• 35i 320 hp
• 35i 306 hp

Useful references

For regulatory and sector references, see Reglement (UE) 461/2010 — pieces de rechange et garantie constructeur.