Parts for your 2018 Subaru Impreza-Spark plugs

2018 Subaru Impreza Spark Plugs

Yes, the 2018 Subaru Impreza uses spark plugs. The model runs petrol boxer engines (commonly the 2.0‑litre FB20 direct‑injection, and in some markets a 1.6‑litre), which are spark‑ignition designs and therefore rely on spark plugs. Technical references such as the Subaru Owner’s Manual and Service Manual for MY2018 Impreza, plus major plug catalogues from NGK and Denso, list specific iridium spark plugs for this vehicle, confirming they’re standard fitment.

On this Impreza, the spark plugs deliver the high‑energy spark that ignites the air–fuel mix in each cylinder. With direct injection and tight emissions targets, the engine depends on precise, consistent ignition to keep fuel economy sharp and tailpipe emissions low. Fine‑wire iridium plugs are typically specified because they resist wear, fire reliably under lean conditions, and hold their gap for a long service life.

For servicing in Australia and New Zealand, the factory schedule for the 2.0‑litre FB20 direct‑injection engine typically calls for spark plug replacement around 100,000 km or 60 months, whichever comes first. That interval can vary by engine code and market, so the best move is to check the Owner’s Manual or dealer schedule by VIN. At each regular service, it’s smart to note any misfire history and fuel use, if the engine feels a bit flat, idles roughly, or is harder to start, the plugs could be due earlier—especially if most driving is short trips.

• Replace all four at the same time, using OEM‑equivalent iridium plugs with the correct heat range and reach for the FB engine.
• Do not apply anti‑seize to new plugs unless the plug maker explicitly permits it, most modern plugs are pre‑coated, and anti‑seize can alter torque.
• Use a torque wrench and follow the factory spec, proper seating protects the alloy heads and ensures good heat transfer.
• Avoid re‑gapping fine‑wire iridium tips, use the factory‑specified gap and handle carefully if checking.
• Inspect coil boots for cracks and ensure the plug tubes are clean and dry before refitting.

Look after the plugs and coils, and the Impreza rewards with smooth running, better fuel economy, and fewer cold‑morning dramas.

Popular questions about 2018 Subaru Impreza spark plugs

What spark plugs does a 2018 Subaru Impreza use?
The 2.0‑litre FB20 direct‑injection engine is specified for long‑life iridium spark plugs from brands such as NGK or Denso, matched to the correct heat range, reach and seat. Exact part numbers can vary by engine code and market, so it’s best to confirm against the VIN in the Owner’s Manual or a reputable parts catalogue.

How often should the plugs be replaced in Australia or New Zealand?
Most factory schedules for the MY2018 Impreza with the FB20 DI engine call for replacement about every 100,000 km or 60 months. Heavy city use, lots of cold starts, or noticeable misfires can justify earlier replacement. Always follow the local Subaru service schedule for your vehicle.

What are the signs the plugs need changing?
Hard starting, rough idle, hesitation under load, poorer fuel economy, and a check‑engine light for misfire codes are common clues. If those symptoms show up, testing the ignition system and inspecting the plugs is worthwhile even if the kilometre count is short of the scheduled interval.