2018 Subaru Impreza Maintenance Schedule
Photo: Radu Daniel ( MRD ) / Pexels
The 2018 Subaru Impreza launched the fifth generation with a choice of CVT or 5-speed manual transmission, and Subaru's Symmetrical AWD as standard equipment. The FB20 flat-4 engine uses a timing chain rather than a belt, reducing long-term maintenance costs, but the CVT requires diligent fluid service to ensure longevity. This schedule reflects Subaru's published intervals for normal-to-severe driving conditions common in US markets.
Service Intervals
| Service | Interval | Est. Cost |
|---|---|---|
| Engine Oil & FilterSubaru specifies 0W-20 synthetic oil; the FB20 boxer engine's horizontal layout makes regular changes essential to prevent oil starvation in the cylinder heads. | 6,000 mi / 6 mo | $45-$75 |
| Tire RotationAWD systems wear tires unevenly if not rotated regularly; mismatched tread depth can damage the center differential and CVT. | 7,500 mi | $25-$50 |
| Cabin Air FilterLocated behind the glovebox; replacement improves HVAC airflow and reduces allergens in the cabin. | 12,000 mi / 12 mo | $15-$35 |
| Engine Air FilterInspect at every oil change; the FB20's naturally aspirated design is sensitive to restricted airflow affecting fuel economy. | 30,000 mi | $20-$45 |
| Brake Fluid ExchangeSubaru specifies DOT 3 or DOT 4; moisture absorption over time reduces boiling point and can cause brake fade or ABS module corrosion. | 36 mo | $80-$120 |
| Brake Pads & Rotor InspectionInspect at every tire rotation; front pads typically wear faster due to AWD weight distribution, and replacement cost includes resurfacing or replacing rotors if warped. | 30,000 mi | $250-$450 |
| CVT Fluid ReplacementSubaru High Torque CVT Fluid is required. Official normal service is inspect-only with no required changes, but severe-duty driving (towing, mountains, stop-and-go, trailer towing) requires replacement every 25,000 miles. Many owners follow a 60,000-mile preventive interval to avoid shudder and premature wear. This service covers the front differential, which is integral to the CVT in AWD models. | 60,000 mi | $180-$300 |
| Coolant ExchangeSubaru Super Coolant is rated for 11 years/137,500 miles on first fill; subsequent changes every 6 years/75,000 miles maintain corrosion protection for the aluminum block. | 137,500 mi / 132 mo | $120-$180 |
| Spark PlugsIridium plugs are factory-spec with first replacement at 97,500 miles, then every 30,000 miles thereafter (severe service is 60,000 miles first change). The boxer engine's horizontal layout makes access more labor-intensive than inline engines. | 97,500 mi | $150-$250 |
| Rear Differential FluidThe Symmetrical AWD system's rear differential requires 75W-90 gear oil. Subaru specifies replacement at 30,000 miles under severe service only (towing, off-road, dusty conditions); normal service is inspect-only. Many owners follow the severe schedule preventively to avoid whining noise and eventual bearing failure. | 30,000 mi | $70-$110 |
| Battery Inspection & CleaningThe EyeSight system and infotainment draw significant parasitic load; clean terminals and load-test to prevent no-start conditions in cold weather. | 30,000 mi / 24 mo | $15-$40 |
2018 Subaru Impreza Oil Change Interval
The 2018 Subaru Impreza oil change interval is every 6,000 miles or 6 months, whichever comes first (estimated cost $45-$75). Subaru specifies 0W-20 synthetic oil; the FB20 boxer engine's horizontal layout makes regular changes essential to prevent oil starvation in the cylinder heads.
What Happens If You Skip It
- Delaying CVT fluid changes beyond 60,000 miles can cause shuddering, slipping, and eventual transmission failure requiring $4,000-$7,000 replacement.
- Neglecting tire rotation on the AWD system leads to uneven tread wear that can damage the center differential and trigger drivetrain binding.
- Skipping brake fluid exchanges allows moisture buildup that corrodes the ABS module and brake calipers, leading to costly repairs and reduced stopping power.
- Ignoring rear differential fluid changes causes bearing wear and whining noise, eventually resulting in differential failure and loss of AWD functionality.
- Overdue spark plug replacement on the FB20 can cause misfires, catalytic converter damage, and reduced fuel economy due to incomplete combustion.
- Failing to maintain proper oil change intervals in the boxer engine accelerates valve train wear and can lead to oil consumption issues common in older FB-series engines.
Common Issues at Higher Mileage — 2018 Subaru Impreza
CVT shudder or hesitation during acceleration, often resolved with fluid change but may indicate worn clutch packs in severe cases.
Excessive oil consumption in some FB20 engines due to piston ring design; monitor oil level between changes and consider switching to 5W-30 if consumption exceeds 1 qt/1,000 mi.
Front wheel bearing noise (humming or grinding) due to AWD system stress and road salt exposure in northern climates.
EyeSight camera calibration drift or windshield-mounted sensor issues requiring recalibration after windshield replacement or alignment work.
Rear differential fluid leaks from pinion seal or axle seals, often discovered during routine service as dark staining on the differential housing.
Timing chain tensioner wear may produce rattling noise on cold starts; while the chain itself is durable, tensioner and guide replacement is preventive maintenance at high mileage.
FAQ
How often does a 2018 Subaru Impreza need an oil change?
The 2018 Subaru Impreza oil change interval is every 6,000 miles or 6 months, whichever comes first (estimated cost $45-$75). Subaru specifies 0W-20 synthetic oil; the FB20 boxer engine's horizontal layout makes regular changes essential to prevent oil starvation in the cylinder heads.
What maintenance does a 2018 Subaru Impreza need?
The most important 2018 Subaru Impreza services: engine oil & filter every 6,000 mi / 6 mo; tire rotation every 7,500 mi; brake fluid exchange every 36 mo; brake pads & rotor inspection every 30,000 mi; cvt fluid replacement every 60,000 mi. See the full intervals table above for every service with estimated costs.
What are common Subaru Impreza problems at higher mileage?
60,000+ mi: CVT shudder or hesitation during acceleration, often resolved with fluid change but may indicate worn clutch packs in severe cases. 80,000+ mi: Excessive oil consumption in some FB20 engines due to piston ring design; monitor oil level between changes and consider switching to 5W-30 if consumption exceeds 1 qt/1,000 mi. 70,000+ mi: Front wheel bearing noise (humming or grinding) due to AWD system stress and road salt exposure in northern climates. 100,000+ mi: EyeSight camera calibration drift or windshield-mounted sensor issues requiring recalibration after windshield replacement or alignment work. 90,000+ mi: Rear differential fluid leaks from pinion seal or axle seals, often discovered during routine service as dark staining on the differential housing. 120,000+ mi: Timing chain tensioner wear may produce rattling noise on cold starts; while the chain itself is durable, tensioner and guide replacement is preventive maintenance at high mileage.
