It can be worth buying if you want the performance and can afford premium-car upkeep—but the available figures do not support buying one as a fuel-saving bargain or treating it as proven reliable. The best-documented examples are BMW’s M550d xDrive, X5 M50d and X6 M50d. Whether a particular car makes sense depends on its year, market, condition, service history, recall status and likely repair costs.
Which cars does “triple-turbo diesel” mean?
There is no single vehicle or specification implied by the phrase. BMW’s 2012 technical release covers the M550d xDrive, X5 M50d and X6 M50d as M Performance models. These are useful examples, not a basis for assuming every triple-turbo diesel has the same configuration or ownership costs. BMW’s release is historical technical information, not a guide to the condition or cost of a used car today.
What does a triple-turbo diesel cost to own?
ADAC’s German-market cost calculator gives a concrete illustration for one specific vehicle: the BMW X5 M50d xDrive Steptronic, model period July 2014 to July 2017. Accessed in 2026, its estimate is based on a €97,570 vehicle price, five years of ownership and 15,000 km driven per year. It is a scenario, not a current quote for a used X5 or a forecast for your location.
| ADAC figure | What it represents |
|---|---|
| €998 per month; €0.798 per km | Total estimated cost in the stated X5 scenario, including depreciation, operating, fixed and workshop costs. |
| €269 per month | Workshop costs in that same scenario. |
| €220 per month | Operating costs in that same scenario. |
| €297 per month | Fixed costs in that same scenario. |
| €210 per month | Depreciation in that same scenario. |
| €441 per year | ADAC’s listed vehicle tax for the cited variant without tax exemption, in its German context. |
All monthly and per-kilometre figures above are components of ADAC’s individualized calculation, not universal running costs. A used car’s purchase price, condition, depreciation, annual distance and local taxes and insurance can change the result substantially. See ADAC’s X5 M50d data and cost estimate.
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What fuel economy does it get?
ADAC lists 6.6 L/100 km for the X5 M50d xDrive Steptronic from July 2014 through July 2017. That is a published figure for this specific variant; it is not evidence of what an individual used vehicle will consume in everyday driving. BMW notes that its consumption figures use legislated measurement procedures and refer to German-market vehicles. Compare figures only when the variant, market and test cycle match, then build your own budget around your routes, driving style and fuel prices.
Is a triple-turbo diesel reliable?
The evidence available here does not establish a model-specific long-term failure rate, a distribution of repair bills or a reliable pattern of failures for the triple-turbo engine. ADAC’s cited X5 page currently reports no defects in its defects section, but that is not a reliability guarantee or an engine-specific failure rate. Its breakdown statistics cover the model line or cohort, not a clean measure of the M50d engine. The number of turbochargers alone is not enough to conclude that a car is unreliable—or reliable.
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Check recall completion before buying
ADAC describes an August 2018 EGR-cooler campaign affecting specified BMW diesel ranges, including relevant 5 Series and X5 generations. Across the listed vehicle applications, ADAC reported 500,000 affected vehicles in Germany and 1.6 million worldwide; these totals are not counts of X5 M50d cars. In rare cases, a coolant leak could combine with soot and oil deposits and ignite at high exhaust temperatures. Applicability depends on the exact vehicle and market, so a model-family recall does not mean every example is affected. ADAC’s X5 listing and its M550d listing describe the campaign.
Use BMW’s recall and technical-update page to check the car by its 17-digit VIN. BMW says its partner carries out applicable recall or technical-update work free of charge. Ask the seller for documentary evidence that relevant work has been completed, and confirm the vehicle’s status directly with BMW.
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How to decide whether a particular car is worth buying
Judge the individual car, not the turbo count or a published fuel figure. Before making an offer:
- Confirm the exact model year, variant, market and asking price.
- Review service records and have the car’s current condition assessed independently.
- Check the 17-digit VIN for open recalls and request proof of completed applicable work.
- Get a written maintenance and repair estimate based on the specific car’s inspection findings.
- Calculate likely fuel, tax and insurance costs for your location and expected annual distance.
- Compare fuel figures only on a matching variant and test-cycle basis; do not treat a catalogue number as a real-world promise.
An independent BMW specialist pre-purchase inspection can help identify condition and repair concerns before you commit. Consider buying if the car is well documented and inspected, and its performance is worth the likely premium upkeep to you. If its history, recall completion, condition or repair exposure is unclear, resolve the uncertainty before proceeding—or walk away.
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