2014 — 2018
3.0L S55 Twin-Turbo Inline-6
Petrol
Check the cooling system integrity by listening for any whine from the charge air cooler pump after a spirited drive. | Note: The S55 engine's top-mount intercooler can sometimes develop leaks, so keep an eye on your coolant levels during the test drive.
Listen for any rhythmic clicking or metallic rattling from the front end while performing low-speed turns on uneven surfaces. | Note: Suspension components like control arm bushings are common wear items on our NZ roads, so it is worth a quick physical check of the rubber boots.
Test the DCT transmission by performing a series of slow, stop-and-go maneuvers to ensure the engagement feels smooth rather than jerky. | Note: Clutch wear is expected as mileage increases, so ensuring the transition between gears feels natural is a great way to gauge the health of the gearbox.
Inspect the valve cover gasket area for any signs of oil weeping or a faint burning smell when the engine is warm. | Note: On cars of this vintage, gasket seals can occasionally dry out, making this a common area to monitor during routine servicing.
Consider a full transmission service and fluid change to keep the DCT operating at its best.
A good time to inspect the condition of the turbochargers and the integrity of the coolant lines.
A major service interval where it is wise to replace spark plugs, ignition coils, and perform a comprehensive suspension refresh.
Prioritize engine oil changes every 7,500km to 10,000km, especially given the demands placed on the S55 engine.
Keep a close eye on the front-mount heat exchanger; it sits low and is prone to stone chips on our local roads.
Ensure the brake fluid is flushed every two years to maintain the stopping power this performance sedan is known for.
Verify the air filters are clean, as the S55 benefits significantly from good airflow through the intake system.
Use high-quality 98-octane fuel to ensure the engine mapping runs as the BMW engineers intended.
Estimated repair costs if issues arise
While not guaranteed to fail, some enthusiasts choose to proactively upgrade the crank hub assembly to prevent timing issues. Depending on the car's history, you might eventually need to budget for this if you plan on doing performance tuning.
In cars of this age, it is common to consider the cooling system as a consumable. If these components need attention in the future, the estimated cost in NZ includes quality parts and professional installation.
New Zealand roads can be tough on suspension. Depending on how the car has been driven, you might eventually need to budget for a refresh of the front control arms to maintain that crisp handling feel.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer