BMW M5 F90 Reliability Issues: Common Problems, Maintenance Costs, and What Owners Should Know in 2026

BMW M5 F90 Reliability Issues: What Owners Need to Know

The BMW M5 F90 combines supercar-level performance with daily usability, but that balance comes with specific reliability concerns.

If you are researching BMW M5 F90 reliability issues, the key is understanding which problems are common, which are preventable, and which are simply expensive.

For shoppers and owners in 2026, the F90 remains one of the most capable performance sedans on the road, but long-term ownership depends heavily on maintenance history, driving style, and cooling-system health.

Why the BMW M5 F90 Is So Appealing

The F90-generation BMW M5, produced from 2017 onward, uses the S63 4.4-liter twin-turbocharged V8 and xDrive all-wheel drive.

That powertrain gives the car explosive acceleration, strong traction, and everyday versatility.

It also means more heat, more complexity, and more wear points than a typical luxury sedan.

BMW M cars are engineered for performance first.

As a result, reliability should be judged with that mission in mind.

The F90 can be dependable when maintained correctly, but it is not a low-cost ownership proposition.

Most Common BMW M5 F90 Reliability Issues

Cooling System Stress

Heat management is one of the most important concerns on the F90.

The S63 engine generates significant thermal load, especially during aggressive driving, repeated launches, or track use.

Common cooling-related concerns include coolant leaks, aging hoses, failing thermostats, and water pump wear.

Signs of cooling-system trouble can include:

• Coolant loss without an obvious source
• Temperature fluctuations under load
• Warning messages tied to engine temperature
• Visible residue around hoses, expansion tanks, or fittings

Because overheating can quickly lead to expensive engine damage, cooling inspections should be treated as a priority on any used M5 F90.

Turbocharger and Charge-Air Component Wear

The twin-turbo setup delivers the M5’s signature power, but turbo hardware lives under intense stress.

Over time, owners may encounter boost leaks, wastegate-related noise, cracked charge pipes, or intercooler system issues.

Symptoms often show up as reduced power, sluggish boost response, check-engine lights, or unusual whistling and rattling sounds.

Modified cars are at higher risk, especially if tuning pushes boost levels beyond factory margins.

Oil Leaks and Gasket Seepage

Like many high-performance German engines, the S63 can develop oil seepage from seals and gaskets as mileage rises.

Valve cover gaskets, oil filter housing areas, and other engine seals should be inspected during routine service.

Small leaks may not affect drivability at first, but they can become more serious if ignored.

Oil on hot engine components may also create burning smells that should never be dismissed.

Transmission and Drivetrain Concerns

The ZF 8-speed automatic in the M5 F90 is generally strong, but it still requires proper fluid service and careful use.

Hard launches, aggressive tuning, and neglected maintenance can accelerate wear in the transmission, transfer case, and differential assemblies.

Possible signs of drivetrain issues include:

• Harsh or delayed gear changes
• Shuddering during acceleration
• Driveline noise under load
• Transfer-case warning messages

Because the F90 uses xDrive, drivetrain maintenance is more complex than on rear-wheel-drive performance sedans.

Electronics and Sensor Faults

The F90 is loaded with electronics, including driver-assistance systems, adaptive suspension, multiple drive modes, and a sophisticated infotainment setup.

While this improves comfort and control, it also increases the number of potential fault points.

Owners occasionally report sensor malfunctions, warning lights, camera or parking-assist glitches, and software-related quirks.

In many cases, the issue is resolved with programming, software updates, or replacement of a failed sensor rather than a major mechanical repair.

Are BMW M5 F90 Reliability Issues Worse on Modified Cars?

Yes, modified examples often carry more risk.

Engine tunes, downpipes, upgraded turbos, and transmission tuning can improve performance, but they also increase heat, stress, and the chance of premature wear.

Cars with aggressive tuning may also have nonstandard maintenance histories, which makes long-term reliability harder to predict.

If you are considering a modified M5 F90, review supporting documentation carefully.

Look for professional installation, cooling upgrades, regular fluid changes, and evidence that the owner used high-quality parts and fuel.

Maintenance That Makes the Biggest Difference

Preventive maintenance is the most effective way to reduce BMW M5 F90 reliability issues.

A well-cared-for example can be much more dependable than a neglected lower-mileage car.

Prioritize These Services

• Regular oil changes with the correct BMW-approved specification
• Coolant inspections and replacement as needed
• Transmission and transfer-case fluid service
• Differential fluid maintenance
• Brake fluid replacement
• Inspection of belts, hoses, and ignition components

Shorter service intervals are often wise for M5 ownership, especially if the car is driven hard or sees track use.

Waiting for the longest possible factory interval usually costs more in the end.

Use the Car Warm and Cool It Down Properly

Cold starts and immediate hard driving are hard on the S63 engine.

Let the oil temperature rise before applying heavy throttle.

After spirited driving, a brief cooldown period can help reduce thermal stress on turbo components and related plumbing.

What Should Buyers Check Before Purchasing a Used F90?

A pre-purchase inspection is essential.

The M5 F90 may look flawless cosmetically while hiding expensive mechanical issues.

A BMW specialist can spot early signs of trouble that a general inspection might miss.

Key items to review include:

• Complete maintenance records
• Evidence of coolant or oil leaks
• Fault codes stored in the vehicle computer
• Turbo and boost performance during road testing
• Condition of brakes, tires, and suspension components
• Any signs of tuning, coding, or aftermarket modifications

A clean diagnostic scan and detailed service history matter more than mileage alone.

Is the BMW M5 F90 Expensive to Own?

Yes, ownership costs are high relative to a standard luxury sedan.

Consumables such as tires, brakes, and fluids are significantly more expensive than on non-M models.

Insurance can also be higher because of the car’s performance level and repair costs.

When reliability issues do appear, labor and parts pricing can escalate quickly.

For many owners, the biggest financial challenge is not one major failure but the cumulative cost of proper upkeep.

How Does the F90 Compare With Other Performance Sedans?

Compared with rivals like the Mercedes-AMG E63 S and Audi RS7, the M5 F90 sits in a similar performance and complexity bracket.

All of these cars deliver extreme output and advanced technology, and all require disciplined maintenance.

The BMW’s reputation for driving dynamics is excellent, but its reliability is best viewed as strong for the segment rather than inexpensive or carefree.

In other words, the F90 is a performance-first machine that rewards informed ownership.

Buyers who understand its needs are far more likely to enjoy a positive experience.

What Is the Bottom Line on BMW M5 F90 Reliability Issues?

The BMW M5 F90 can be a rewarding and highly capable sedan, but its reliability depends on careful maintenance and a realistic view of ownership costs.

Cooling-system health, turbo hardware, oil leaks, drivetrain service, and electronics are the main areas to monitor.

For the best experience, choose an unmodified car with documented service history, invest in preventative maintenance, and inspect the car thoroughly before purchase.