What year did Subaru Outback switch to timing chain?
Starting with the 2010 model year, the Subaru Outback began using a timing chain instead of a timing belt.
Historically, early Outback models relied on EJ-series engines with timing belts, which required periodic belt changes. With the 2010 redesign, Subaru introduced new engine families (notably the FB25 2.5-liter four and the EZ36 3.6-liter six) that are chain-driven. This shift reduced belt-maintenance needs, though timing chains still require service if tensioners or guides wear out. Variations can exist by market and trim, so it's important to verify the exact engine configuration for a specific vehicle.
What changed by model year
Below is a concise guide to the switch and what it means for maintenance and engine design across model years.
- 2010 and later Outbacks generally use timing chains in their main engines (FB25 2.5L and EZ36 3.6L), eliminating the need for belt replacement in routine service.
- Pre-2010 Outbacks used timing belts on EJ-series engines (2.5L and 3.0L), with recommended belt replacement intervals typically around 105,000 miles or per maintenance schedule.
- Variations exist by market and trim; some earlier 3.6L or other configurations may have different timing systems, so verify the engine code (e.g., EJ vs EZ/FB) for a specific car.
In practice, this means that shopping for a 2010+ Outback gives you the chain-driven timing design, while older models require belt maintenance. Always confirm engine type by checking the VIN or owner’s manual for the exact timing system in a given vehicle.
Maintenance implications
Timings chains generally don’t have a fixed replacement interval like belts, but wear can occur in tensioners, guides, and chain rails. For 2010+ Outbacks, routine maintenance (oil changes, inspections) should include checking chain-related components if there are any unusual noises or performance issues. If you’re buying used, have a qualified mechanic inspect the timing chain, guides, and tensioners for the specific year and engine code.
Summary
The Subaru Outback shifted to timing chains with the 2010 model year, as part of a broader move to newer FB/EZ-series engines. This change reduced the routine belt maintenance seen in older models, though chain wear and tensioner/guide issues can still arise. When evaluating a used Outback, confirm the engine type and timing system for the exact year and trim.
