The 2018 Subaru Outback belongs to the 5th generation (2015-2019), built with 2.5L FB25 flat-four or 3.6L EZ36 flat-six, both with the Lineartronic CVT. It takes 0W-20 full synthetic. Oil changes run 6,000 miles or 6 months - notably shorter than most rivals. This is a late year of that generation, typically the most refined build after several years of running changes.
A 2018 Subaru Outback is 8 years old in 2026, which at an average 12,000 miles a year puts it around 96,000 miles - the interval that decides its future. At roughly 96,000 miles a vehicle enters the window that most separates the ones that reach 200,000 miles from the ones that do not. Keeping up with whatever its own manufacturer schedule calls for here is what avoids expensive failures later. On that mileage estimate it is already past its 90,000-mile service, a repeat of the 30,000-mile service. The next milestone on its own schedule is 100,000 miles, under a year away at average use, listed as: Inspect Lineartronic CVT fluid and chain, Inspect timing chain and water pump, Inspect PCV valve.
The fault most worth knowing about on this generation is Battery drain complaints traced to parasitic draw on some builds. Owners also report Oil consumption on some FB25 engines, which makes the short interval more important not less; and CVT chain and torque converter complaints on higher-mileage examples. None of these are certainties on any individual vehicle - they are the patterns worth checking for when you buy or when a symptom appears.
Track your 2018 Subaru Outback service history free with the ServiceSage maintenance tracker, or compare it against other model years on the Subaru Outback maintenance schedule hub.
| Interval | Service |
|---|---|
| Every 3,750 mi (severe duty) | Engine oil & filter change, Rotate tires, Inspect fluid levels |
| Every 6,000 mi / 6 months | Engine oil & filter change (0W-20 FB25; 5W-30 3.6R EZ36 H6), Rotate tires, Inspect brakes and suspension, Inspect axle boots |
| Every 12,000 mi | Replace cabin air filter, Inspect brake pads and rotors, Check wheel alignment |
| Every 30,000 mi / 30 months | Replace engine air filter, Replace brake fluid (DOT 3), Inspect drive belt, Inspect steering and suspension |
| Every 60,000 mi | Replace spark plugs (FB25 and EZ36 H6 iridium), Rear differential fluid change, CVT fluid drain & fill (recommended despite lifetime label), Inspect valve clearance (FB25) |
| Every 100,000 mi | Inspect Lineartronic CVT fluid and chain, Inspect timing chain and water pump, Inspect PCV valve |
| Every 137,500 mi / 11 years | Engine coolant flush (Subaru Super Coolant blue), Inspect entire cooling system |
The table above is indexed by service interval. This is the same schedule indexed by odometer reading, for when you know your mileage and want the list. If your odometer sits between these figures, work back to the last one you passed and catch up anything skipped.
| Odometer | Service due |
|---|---|
| 30,000 mi (48,000 km) | Engine oil & filter change (0W-20 FB25; 5W-30 3.6R EZ36 H6), Rotate tires, Inspect brakes and suspension, Inspect axle boots, Replace engine air filter, Replace brake fluid (DOT 3), Inspect drive belt, Inspect steering and suspension. The every-12,000 mi service runs on its own cycle - the nearest fall at 24,000 and 36,000 miles. |
| 60,000 mi (97,000 km) | Engine oil & filter change (0W-20 FB25; 5W-30 3.6R EZ36 H6), Rotate tires, Inspect brakes and suspension, Inspect axle boots, Replace cabin air filter, Inspect brake pads and rotors, Check wheel alignment, Replace engine air filter, Replace brake fluid (DOT 3), Inspect drive belt, Inspect steering and suspension, Replace spark plugs (FB25 and EZ36 H6 iridium), Rear differential fluid change, CVT fluid drain & fill (recommended despite lifetime label), Inspect valve clearance (FB25). |
| 90,000 mi (145,000 km) | Same as the 30,000 mi service. The every-12,000 mi service runs on its own cycle - the nearest fall at 84,000 and 96,000 miles. |
| 100,000 mi (161,000 km) | Inspect Lineartronic CVT fluid and chain, Inspect timing chain and water pump, Inspect PCV valve. The every-6,000 mi service runs on its own cycle - the nearest fall at 96,000 and 102,000 miles. |
| 120,000 mi (193,000 km) | Same as the 60,000 mi service. |
| 150,000 mi (241,000 km) | Same as the 30,000 mi service. The every-12,000 mi service runs on its own cycle - the nearest fall at 144,000 and 156,000 miles. |
| 200,000 mi (322,000 km) | Same as the 100,000 mi service. The every-6,000 mi service runs on its own cycle - the nearest fall at 198,000 and 204,000 miles. |
| Part | Fitment note | Buy |
|---|---|---|
| Mobil 1 0W-20 Full Synthetic (5 qt) | For the 2.5L FB25 | Check price on Amazon |
| 5W-30 Full Synthetic Motor Oil (6 qt) | For the 3.6L EZ36 H6 only - not the FB25 | Check price on Amazon |
| Subaru 15208AA15A Oil Filter | Fits the 2.5L FB25 - the 3.6L EZ36 H6 uses 15208AA12A instead | Check price on Amazon |
| Subaru 16546AA10A Engine Air Filter | Fits 5th gen Outback (2015-2019) | Check price on Amazon |
| NGK SILZKR7B11 (9723) Laser Iridium Spark Plug (4-pack) | For the 2.5L FB25, every model year - mandatory at 60,000 mi due to the FB25's known fouling history | Check price on Amazon |
| Subaru 72880AJ00A Cabin Air Filter | Fits every Outback 2015-2026 | Check price on Amazon |
| Subaru Genuine Super Coolant Blue Prediluted SOA868V9272 (1 gal) | Use only Subaru Super Coolant blue - do not mix coolant types | Check price on Amazon |
| Subaru High Torque CVT Fluid (HTCVTF-II) | The exact part number differs by transmission (TR580 4-cyl vs TR690 6-cyl/turbo) - confirm against your VIN before buying | Check price on Amazon |
| Valvoline Full Synthetic 75W-90 Gear Oil GL-5 (1 qt) | Rear differential, every model year | Check price on Amazon |
| Subaru Genuine DOT 3 Brake Fluid SOA906V9222 (12 oz) | Time-based change every 30,000 mi or 30 months | Check price on Amazon |
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| Fastener | Torque | Size |
|---|---|---|
| Lug nut | 89 ft-lbs (120 Nm) | 19mm |
| Oil drain plug | 31 ft-lbs (42 Nm) | 14mm |
| Spark plug | 13 ft-lbs (18 Nm) | 14mm |
Maintenance keeps these away, but when the dash does light up these are the codes this vehicle throws most often - each with what it means and what the repair actually costs.