2016 Mazda 6 2.2L Diesel · SM16 SVV

The most recent DVSA examination on 4 September 2025 resulted in a pass, but the same test date also produced a failure triggered by exhaust emissions exceeding the default opacity limit under section 8.2.2.2 (b), suggesting that diesel particulate filter condition or fuel system efficiency warrants verification. Both records carry an advisory concerning an insecure rear heat shield, a minor cosmetic and safety item that should be re-secured to prevent rattling and potential exhaust fume ingress. Reviewing the broader trajectory across 2021 to 2025, the maintenance profile indicates a vehicle with recurring underlying concerns rather than a stable or improving trend. Anti-roll bar linkage wear has now been recorded as a Major failure on two separate occasions (2021 nearside front and 2023 nearside front), a fractured offside rear coil spring was identified in 2023, brake pipes have been progressively flagged for corrosion across multiple annual tests, and brake discs on the rear axle have shown persistent pitting and scoring. This accumulation of advisories spanning suspension, braking, exhaust, and underbody integrity indicates a car needing several mechanical maintenance items. The recorded odometer reading of 185,948 miles on a ten-year-old Mazda 6 equates to an annualised accumulation of approximately 18,600 miles, which is notably above the typical UK average of 8,000 to 12,000 miles per year. MOT records demonstrate consistent year-on-year mileage progression without extended standing periods, confirming that this vehicle has been in regular, sustained service. Such usage intensity accelerates wear on all consumables including tyres, brake friction material and fluid, clutch assemblies on manual variants, and drivetrain mountings. High-mileage examples of this generation also benefit from particular attention being given to the diesel dual-mass flywheel if applicable, automatic transmission fluid degradation if so equipped, and turbocharger condition given the emissions advisory noted in the most recent test. Given the recurring pattern of suspension and brake component advisories, a prospective buyer should conduct a focused test drive listening for clonking or knocking from the front suspension over uneven surfaces, which would indicate worn anti-roll bar drop links or bushes requiring replacement, and for a noticeably harsh or crashing ride quality over undulating roads that would confirm the deteriorated coil spring. The rear brake discs recorded as pitted and scored in both 2021 and 2024 should be inspected for lipping, run-out, and caliper slide pin binding; vibration through the brake pedal or steering wheel under braking would suggest the discs have now reached their minimum thickness. Brake pipe corrosion flagged across four corners should be physically examined by raising the vehicle, as surface-applied grease is often a temporary measure masking active rusting that may necessitate pipe replacement at MOT retest. The exhaust advisory should prompt a cold-start inspection for visible smoke, and a diagnostic scan for stored diesel particulate filter regeneration history. Beyond the documented MOT findings, age and mileage-appropriate inspections should include a thorough check of all four tyres for sidewall perishing and cracking, as ten-year-old rubber compounds harden and lose grip regardless of remaining tread depth. The 12-volt battery should be load-tested, as Mazda electrical systems are sensitive to voltage drop and original batteries of this vintage are typically beyond reliable service life. Brake fluid, engine coolant, and any automatic transmission fluid should be verified for recent replacement in line with calendar-based service intervals rather than purely mileage intervals, given the age of the vehicle. Underneath, the undershield and heat shield fixings should be confirmed secure, and a comprehensive scan for stored fault codes should be undertaken to identify any intermittent sensor or emissions-related issues that may not yet have triggered a warning light but could contribute to a future failure.