NGK U5015 Coil-On-Plug Ignition Coils — Pack of 4

Construction quality sets these apart from budget alternatives. High-quality electrical steel lamination maximizes magnetic efficiency so the coil generates the strongest possible spark with minimal energy waste. A vacuum-sealed epoxy resin encapsulation locks out moisture and vibration, while a shellac winding coating on the internal windings adds a critical barrier against voltage arc — one of the most common failure modes in aging coils. The high-grade dielectric thermal plastic housing ties it all together, resisting the relentless heat cycling that causes cheaper coils to crack, degrade, and eventually misfire.

Every U5015 is validated in an ISO 17025 accredited test laboratory under stress conditions that far exceed anything your BMW will encounter on the street or the track. That level of verification isn't common in the aftermarket — it's the kind of process NGK shares with OE suppliers, which is precisely why these coils meet and in many cases exceed factory performance standards.

Sold as a set of four, the NGK U5015 is the sensible choice for a full preventative refresh or a targeted fix for misfires and rough idle. Replacing all four at once eliminates the risk of chasing new symptoms from aging units and gives you a consistent, reliable ignition baseline across every cylinder — whether the car is running a stock tune or has been modified for more power.