Parts for your 2018 Mitsubishi Eclipse cross-Spark plugs

2018 Mitsubishi Eclipse Cross – Spark Plugs

Yes, spark plugs are relevant and fitted to the 2018 Mitsubishi Eclipse Cross. The model launched with Mitsubishi’s 1.5L MIVEC turbocharged direct‑injection petrol (4B40) engine, which is a spark‑ignition design and requires spark plugs. This is supported by the Mitsubishi Eclipse Cross Owner’s Manual and Service/Workshop Manual (which list spark plug specifications and service intervals) and by major fitment catalogues from NGK and Denso for the 2018 Eclipse Cross.

On the 2018 Eclipse Cross, spark plugs do the critical job of igniting the air–fuel mix in each cylinder. Healthy plugs help the 1.5T engine start cleanly on cold mornings, pull strongly through the rev range, and keep fuel use and emissions in check. Because this is a turbocharged, direct‑injection petrol, plug condition and the correct heat range matter a bit more than on older, naturally aspirated engines. Mitsubishi specifies long‑life iridium plugs, chosen for their durability and stable spark under boost.

For servicing in Australia and New Zealand, most workshops treat spark plugs as a long‑interval item: iridium plugs typically last up to around 90,000–100,000 kilometres, though many technicians prefer a 60,000–80,000 km change on small turbo DI engines to maintain crisp performance. It’s smart to have them inspected at regular services, especially if the vehicle does lots of short, stop–start trips. Tell‑tale signs they’re due include rough idle, sluggish acceleration, higher fuel consumption, hard starting, and a check engine light with misfire codes.

Replacement is straightforward but benefits from the right approach: use the exact OEM‑equivalent iridium plugs specified for the 4B40 engine, install on a cool engine, avoid anti‑seize on modern plated threads, and tighten to the factory torque. Replace all four at once, and give the coil boots a look for cracking or carbon tracking. Sticking with the correct plug gap (usually pre‑set on quality iridium plugs) and keeping up with clean air and fuel filters helps the new plugs last their full distance.

• Use OEM‑spec iridium plugs from a reputable brand.
• Inspect from 30,000–45,000 km, replace around 60,000–100,000 km depending on use.
• If misfires appear under load, check plugs and coils together.

Technical sources referenced: Mitsubishi Eclipse Cross (2018) Owner’s Manual, Mitsubishi 4B40 Engine Service Manual, NGK Spark Plugs AU/NZ application catalogue, Denso AU/NZ spark plug catalogue.

Popular questions about 2018 Mitsubishi Eclipse Cross spark plugs

What type of spark plug does a 2018 Eclipse Cross use?
The 1.5L turbo petrol uses long‑life iridium spark plugs in the OEM‑specified heat range. Quality equivalents from well‑known brands match the Mitsubishi specification, arrive pre‑gapped, and are designed to handle turbocharged cylinder pressures.

How often should the spark plugs be replaced?
Many owners see reliable service out to around 90,000–100,000 kilometres, but workshops in Australia and New Zealand often recommend 60,000–80,000 km on small turbo DI engines for best drivability. Driving style and fuel quality can shorten or extend that window.

What are the symptoms of worn spark plugs?
Common clues include hard starting, a lumpy idle, hesitation under load, poorer fuel economy, and a check engine light with misfire codes (such as P0300–P0304). If these show up, a plug and coil inspection is worthwhile.