What goes wrong, what it costs, and what to check before you buy a used BMW 8 Series.
The BMW 8 Series occupies a niche position on the UK market.
We track 5 known issues across the BMW 8 Series range, including 2 rated as safety-critical. Knowing which variants and configurations to approach with caution can save you from expensive surprises after purchase.
Found a BMW 8 Series? Enter the reg to see which of our 5 known issues apply to that exact car, plus full MOT history and mileage checks.
G15 (2018–2024) — Petrol options included the 4.4 V8, with 3.0 Diesel on the diesel side. Our database flags 5 known issues on this generation, 2 of which are rated as safety-critical. The most significant concern is Driveshaft flexible coupling failure.
The driveshaft flexible coupling (also called a giubo or flex disc) connects the transmission output to the propshaft on rear-wheel drive BMWs. MOT data shows this model fails at 225 times the fleet average rate for coupling deterioration, specifically on 3.0 diesel variants. The coupling is a rubber and metal disc designed to absorb vibration, but premature failure on the G15 causes dangerous loss of drive or complete driveline separation. This appears to be a design or material issue specific to this generation.
Complete coupling failure causes immediate loss of drive and potential damage to the propshaft, differential, or transmission. The propshaft can separate completely creating a dangerous road hazard. The car becomes immobile and recovery is required. Replacement requires transmission-out work at specialist level.
Listen for clunking or vibration from underneath when pulling away or changing direction. Check for play in the driveshafts by rocking the car in gear with the handbrake on. Worn CV boots are a telltale sign — look for grease splatter around the inner wheel arch.
MOT data shows the G15 fails at 130 times the fleet average for excessive steering free play, specifically affecting 4.4 petrol variants at higher mileages. This indicates premature wear in steering linkage components including track rod ends, steering rack bushes, or intermediate shaft joints. Excessive free play affects vehicle control and steering response, particularly dangerous at motorway speeds where small steering inputs become ineffective.
Excessive free play compromises vehicle control, particularly in emergency maneuvers or at higher speeds. Complete failure of steering components can result in loss of steering control. The vehicle will fail MOT and should not be driven until repaired.
During the test drive, check the steering for excessive play, vibration or pulling to one side. Listen for groaning or whining when turning the wheel at low speed. Power steering fluid level and condition should be checked on hydraulic systems.
MOT statistics show the G15 fails at up to 124 times the fleet average for worn suspension pins, bushes, and joints, with over 1,000 recorded failures across the 4.4 petrol variants. This suggests a systematic issue with suspension component durability, likely related to the vehicle's weight and performance setup. Worn bushes affect handling precision, tyre wear patterns, and ride comfort.
Worn suspension components reduce handling precision and may cause dangerous instability during emergency maneuvers. Continued driving accelerates tyre wear and can damage other suspension elements. Multiple components often need replacement together, increasing repair costs significantly.
Listen for knocking, clunking or rattling over bumps during the test drive. Inspect the underside for corroded or cracked suspension components. Check the MOT history for suspension-related advisories, which often predict future failures.
US NHTSA data also documents coolant tank leakage issues. The G15 appears prone to cooling system leaks from multiple sources including expansion tanks, hoses, and connection points. BMW cooling systems use plastic components that become brittle with heat cycling.
Coolant leaks can lead to engine overheating and potential head gasket failure or engine seizure if not addressed promptly. Even small leaks should be investigated as they often worsen rapidly. Major cooling system failure can result in complete engine replacement.
Check the coolant level and look for any white residue or staining around hoses, the expansion tank and radiator. After a test drive, check the temperature gauge stayed stable and look underneath for drips. Ask whether key cooling components have been replaced.
3 times the average, with nearly 1,100 total failures recorded. This suggests the brake system components are not adequately protected against corrosion or are using materials that deteriorate prematurely. Brake system integrity is critical for safety.
Brake system failure poses immediate safety risk to occupants and other road users. Corroded brake lines or deteriorated hoses can fail suddenly, resulting in complete loss of braking ability. Any brake system defect requires immediate professional attention.
Check brake disc condition for lipping or scoring. Test braking at moderate speed for pulling to one side or vibration through the steering wheel. Review MOT advisories for brake-related items.
For the full breakdown of all 5 tracked issues with repair costs, see the BMW 8 Series common problems page.
Based on 9k real DVSA MOT tests, the BMW 8 Series fails more often than average on several items. The biggest outlier is transmission shaft flexible coupling deteriorated at 225x the fleet average, followed by tyre cords visible or damaged (10x).
When viewing a specific car, check its MOT history for recurring advisories in these categories. See the full BMW 8 Series MOT failure breakdown for data at every mileage point.
Routine servicing (oil and filter change every 10k miles) typically costs £150–£250 at an independent garage.
The bigger-ticket items to budget for include spark plugs (£200–£350).
See the full BMW 8 Series service schedule for every interval and cost breakdown.
The BMW 8 Series has some well-documented weak points, including 2 safety-critical issues that demand careful checking. The right example, properly maintained, can still be a sound purchase — but cutting corners on the pre-purchase inspection is not advisable.
Before committing, check the car's full MOT history, verify the service record is complete, and if possible arrange a specialist inspection. Enter any registration into our free report to see the complete picture.
Get Car Wise maintains a database of known mechanical issues for every popular car on UK roads, tracking the faults that owners, specialists and DVSA data reveal.
When you run a report on a specific BMW 8 Series, we cross-reference the exact variant, engine and age against our database of 5 known issues. Combined with full MOT history analysis, mileage verification and DVLA data, you get a complete picture before viewing.
Enter the registration for MOT history, mileage verification, known faults for that exact variant, and a Get Car Wise Score.
This guide was compiled from independent expert reviews, DVSA MOT data, specialist workshops and our own database of 5 known BMW 8 Series issues. We are not affiliated with any source listed.