2026-10-08 · 5 min read
Subaru Forester Timing Chain Malaysia — FB20 BOXER
Forester FB20/FB20B: timing chain — no belt replacement needed. Change engine oil every 6,000 km with 0W-20 fully synthetic to protect the AVCS (Active Valve Control System) timing actuators. AVCS rattle at cold start: check oil level and quality. FB20 on SJ: FB20 had known oil consumption issues which can accelerate chain wear — monitor oil level.
Forester FB25 Timing Chain
The FB25 boxer engine uses a timing chain on each side of the engine (two chains — one per bank). Both chains are rated for the engine's life. With 0W-20 full synthetic at 10,000 km intervals, chain issues are rare. The horizontally-opposed (boxer) layout means oil drains away from chain components quickly after shutdown — ensuring prompt cold start oiling is important.