2018 Subaru Outback Fluid Specs
A complete reference for every fluid your 2018 Outback needs to stay in top condition. From engine oil to differential gear lube, get the right specs here.
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick Reference
| Fluid | Type/Spec | Capacity |
|---|---|---|
| Engine Oil | ILSAC GF-5 / API SN, 0W-20 | 5.1 quarts (4.8 liters) - 2.5L FB25 engine |
| Engine Coolant | Subaru Super Coolant (Blue, P-HOAT) | 7.7 - 8.2 quarts (7.3 - 7.8 liters) |
| Automatic Transmission Fluid | Subaru High-Torque CVT Fluid (Lineartronic HT) | ~13.1 quarts (12.4 liters) - TR580 CVT |
| Front Differential | API GL-5, 75W-90 Gear Oil | 1.4 quarts (1.3 liters) |
| Rear Differential | API GL-5, 75W-90 Gear Oil | 0.8 quarts (0.75 liters) |
| Brake Fluid | DOT 3 or DOT 4 | As needed |
| Power Steering | This vehicle has Electric Power Steering (EPS), no fluid. | N/A |
| Windshield Washer Fluid | Any quality washer fluid | ~1.0 gallon (~3.8 liters) |
Engine Oil
Specification: Subaru recommends a synthetic 0W-20 engine oil meeting ILSAC GF-5 or API Service SN standards. The genuine Subaru oil is an excellent choice, but any high-quality synthetic 0W-20 from a reputable brand will suffice, provided it meets these specifications. For the 2018 model year, the 2.5L FB25 engine is the primary workhorse.
Capacity: The 2.5L 4-cylinder engine requires 5.1 US quarts (4.8 liters) with a filter change.
Notes: Using the correct oil viscosity is critical for the proper function of Subaru's cam-phasing system (AVCS - Active Valve Control System). Thicker oils can cause sluggish operation and may trigger a check engine light. Due to the boxer engine's design, some oil consumption can be considered normal. We recommend checking your oil level at every other fuel fill-up. Change intervals are typically 6,000 miles or 6 months, but always consult your owner's manual for the schedule that fits your driving conditions.
Engine Coolant (Antifreeze)
Specification: The factory-fill coolant is Subaru Super Coolant, which is a blue, Phosphated Hybrid Organic Acid Technology (P-HOAT) formula. It is specifically designed for engines with aluminum components.
Capacity: The cooling system capacity is between 7.7 and 8.2 US quarts (7.3 to 7.8 liters), depending on the specific model and trim.
Notes: Crucially, do not mix this coolant with other types. Avoid
More specs for the 2018 Subaru Outback
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2018 Subaru Outback Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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