2025 model year · 345+ owner reports · Updated April 2026
According to Au7o's analysis of 345+ owner reports, the 2025 BMW 8 Series has 3 documented known issues. No issues are rated critical, indicating generally reliable ownership. The most commonly reported issue is N63/S63 V8 Oil Consumption in M850i with 140 owner reports. Across all issues, repair costs range from $350 to $5,000. DIY maintenance guides at au7o.io.
On the 2019-2025 BMW 8 Series, the M850i equipped with the N63TU4 twin-turbo V8 carries forward the oil consumption tendencies of the N63 engine family, though the TU4 revision is improved over earlier versions. Oil consumption of 1 quart per 3,000-5,000 miles is still common and considered within BMW's specification. The hot-vee turbo design inherently stresses valve stem seals and turbo oil seals. High-performance driving significantly increases consumption rates.
BMW considers up to 1 quart per 1,200 miles as within specification for the N63 family. For excessive consumption beyond that, inspect turbo oil return lines for restriction (causes oil to push past turbo seals), check the crankcase ventilation system, and evaluate valve stem seal condition. The N63TU4 benefits from updated seals and coatings, so consumption rarely reaches the extreme levels of earlier N63 variants.
Parts and tips from 140+ owners who fixed this issue
On the 2019-2025 BMW 8 Series B58, the 840i with B58 inline-six turbo engine experiences coolant loss primarily from the plastic expansion tank cracking and the electric water pump connection failing. The expansion tank develops hairline cracks at the weld seams that are nearly invisible until significant coolant is lost. The high-performance demands of the 8 Series chassis put additional thermal stress on the cooling system compared to lighter BMW models.
Replace the coolant expansion tank with BMW's latest revision. Inspect the electric water pump and all quick-connect coolant fittings for leaks. Pressure test the entire cooling system after repairs. Replace the expansion tank cap as a weak cap allows premature boiling. Use only BMW-approved blue coolant — mixing coolant types causes gel formation.
Parts and tips from 110+ owners who fixed this issue
On the 2019-2025 BMW 8 Series, the 8 Series equipped with Adaptive M Suspension experiences electronic damper failures, particularly in the rear. The electronically controlled dampers use solenoid valves to adjust firmness in real-time, and these solenoids can fail from fluid contamination or electrical faults. When a damper fails, the system defaults to the stiffest setting on the affected corner, creating a noticeably harsh and uneven ride. The car may also display a suspension warning and disable sport/comfort mode switching.
Replace the failed adaptive damper. BMW's diagnostic system can identify which specific damper has failed through the suspension control module fault memory. The damper must be coded to the vehicle after installation. Replace dampers in pairs (both fronts or both rears) if the vehicle has over 60,000 miles, as the remaining original damper is likely near end of life. Bilstein offers OE-equivalent adaptive dampers at lower cost than BMW parts.
Parts and tips from 95+ owners who fixed this issue
POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)
BMW of North America, LLC (BMW) is recalling certain 2023 Toyota GR Supra, 3 Series Sedan (330i xDrive, M340i xDrive, M3), 5 Series Sedan (530i, 530i xDrive, M5), 4 Series Gran Coupe (430i, 430i xDrive), 4 Series Coupe (430i, 430i xDrive, M440i xDrive), 4 Series Convertible (430i, 430i xDrive, M440i xDrive), 8 Series Coupe (840i, M850i xDrive, M8), 8 Series Convertible (840i, M850i xDrive, M8), 8 Series Gran Coupe (850i xDrive, M8), X3 SAV (X3 xDrive30i, X3M), X4 SAV (X4 xDrive30i), X5 SAV (X5 xDrive40i, X5 M50i, X5M), X6 SAV (X6 xDrive40i, X6 M50i, X6M), and Z4 sDrive30i, Z4 M40i vehicles. The weld seam of the integrated transmission control unit's cover may not have been manufactured properly, which could allow automatic transmission oil to leak into the transmission control unit.
Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.
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According to Au7o's analysis of 345+ owner reports, the 2025-2025 BMW 8 Series has 3 documented issues. The most frequently reported are: N63/S63 V8 Oil Consumption in M850i, B58 Engine Coolant Loss from Expansion Tank and Water Pump, Adaptive Suspension Damper Malfunction. None are rated critical, but regular maintenance is recommended.
The 2025-2025 BMW 8 Series has 3 known issues documented across 345+ owner reports. No issues are rated critical, suggesting generally good reliability. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known BMW 8 Series issues range from $350 to $5,000, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
The M850i equipped with the N63TU4 twin-turbo V8 carries forward the oil consumption tendencies of the N63 engine family, though the TU4 revision is improved over earlier versions. Oil consumption of 1 quart per 3,000-5,000 miles is still common and considered within BMW's specif… Repairs typically run $500-$5,000. Severity: medium.
The 840i with B58 inline-six turbo engine experiences coolant loss primarily from the plastic expansion tank cracking and the electric water pump connection failing. The expansion tank develops hairline cracks at the weld seams that are nearly invisible until significant coolant… Repairs typically run $350-$800. Severity: medium.
The 8 Series equipped with Adaptive M Suspension experiences electronic damper failures, particularly in the rear. The electronically controlled dampers use solenoid valves to adjust firmness in real-time, and these solenoids can fail from fluid contamination or electrical faults… Repairs typically run $800-$2,000. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
