2026-10-08 · 5 min read
Subaru Forester Spark Plugs Malaysia
The Subaru Forester SJ (2013–2018) and SK (2019+) are popular AWD SUVs in Malaysia using the FB25 2.
Subaru Forester Spark Plugs
- Forester FB25 spark plugs: iridium; replace every 100,000 km — iridium plugs are designed for long life; early replacement wastes money; do not follow the 30,000 km schedule for copper plugs
- Forester plug brand: NGK or Denso iridium — both OEM-grade; avoid cheap copper or counterfeit iridium; confirm correct heat range for FB25; wrong heat range causes misfires or pre-ignition
- Forester e-Boxer plug access: electric motor on top of FB20 e-Boxer engine reduces some plug access; confirm access procedure before attempting; some plugs more accessible than others on this layout
- Forester plug symptoms: rough idle, hesitation on acceleration, or reduced fuel economy after 80,000 km — suspect plugs; but diagnose first — can also be air filter or MAF sensor