Denso Spark Plug Set To Suit 225HP - 300HP XR5

Spark plugs to suit stock or tuned power Focus XR5 (ST225)

Premium Denso Iridium Power. Through patented technology, including a 0.4mm diameter centre electrode - the Iridium Power plug produces the hottest, most concentrated spark with the lowest voltage and outperforms any plug today.

Same temperature rating as stock XR5 spark plugs, these are perfect for a 225-300hp vehicle

Tried and tested

While it's possible to replace a single spark plug to diagnose a fault, it's generally recommended to replace all 5 at the same time, especially if they are the last known change is unknown. This helps ensure consistent performance and reduces the likelihood of another plug failing shortly after.

Replacement intervals:

Stock vehicle: Replace the spark plugs every 60,000 km. This is a good preventative maintenance interval for the OEM plugs.

Lightly tuned (Stage 1/2): Every 20,000 to 30,000 km is a sensible interval as higher boost puts more demand on the plugs.

High-power or track-driven cars: Expect to replace them every 10,000 to 20,000 km, depending on the tune and how the car is used.

Note:

Pre gapped to 0.8mm out of the box - factory gap spec: 0.7 mm

Tightening sequence - same as stock spark plugs Ford recommends 28nm

If a torque wrench is unavailable: thread spark plug into the cylinder head until it's hand tight then turn an additional 1/4 turn to crush the sealing washer.