Subaru Service for Outback, Forester, Crosstrek, and Ascent

Because the all-wheel-drive system is always sending power to all four wheels. If one tire is a different size or much less worn, it turns at a different speed, and the drivetrain constantly works to make up the difference. Over time that can strain the center differential or coupling.

What matching means:

• Same brand and model on all four where possible.
• Same size and load index.
• Similar tread depth. Your owner manual gives the guidance for your model.
• Same inflation across each axle as listed on the placard.

If one tire is ruined and the others are worn, you may need more than one new tire. Some tire suppliers can shave a new tire to match; call to confirm whether that is possible for your size.

By measuring. We record tread depth at each tire in several grooves and compare it with the replacement tire and your manual guidance. Then you get the options in writing.

Rotating on schedule keeps all four close together. See new tires and brands and the AWD vehicles page.

The cylinders lie flat, which keeps the engine low but changes a few service habits. Some Subaru engines use a bit of oil between changes, so checking the dipstick every few fill-ups is a smart habit. Older boxer engines are also known for oil and coolant seeps near the cylinder heads.

Other boxer notes:

1. Spark plugs sit on the sides, so replacement takes more labor than on an inline engine.
2. Oil filter placement varies by model and year.
3. A seep can drip onto exhaust parts and smell hot.
4. Use the oil grade on the cap, usually a low-viscosity synthetic.

We note oil level at arrival and photograph any seep. See oil changes.

Differential fluids and CVT fluid. Most Subarus use a Lineartronic CVT, which takes Subaru-specified fluid. Many also have front and rear differential fluids that owners forget about because there is no reminder light.

Follow the schedule in your manual, and use the severe column if you tow, climb mountain roads, or drive dirt roads to trailheads. We check level and condition and let you know what is due. The differential, drivetrain, and 4WD page explains why it matters.

It can. EyeSight uses cameras near the windshield, and some driver-assist systems rely on the vehicle's thrust angle. After an alignment or suspension change, we tell you if your model's guidance calls for a check of the driver-assist system. We do not perform windshield camera calibration.

Outback and Forester owners who carry bikes or gear also wear rear suspension. See the Subaru Outback page for model notes, and outdoor recreation owners for trip prep.

Mostly wagons and crossovers that carry people to trailheads, plus a few performance cars.

Model year matters. Engines, transmissions, and turbo options have changed across generations, so we look up your exact car by VIN before quoting parts or fluids.

The BRZ stands apart because it is rear-wheel drive and does not share the all-wheel-drive tire rules. The Solterra follows our electric vehicle limits: high-voltage work goes to a specialist.

Dirt roads and loaded cargo areas shape Subaru wear. Washboard roads to campgrounds loosen suspension parts and tear CV boots, and a roof box plus gear works the rear struts.

Wear points we check:

• CV boots: torn boots throw grease inside the wheel.
• Wheel bearings: a hum that grows with speed.
• Rear pads and rotors: often wear sooner than owners expect on wagons.
• Rear struts: sag or bounce with a full load.
• Rock chips on the windshield: may affect EyeSight, which is a glass shop or dealer job.

Before your visit, bring past tire receipts so we can match brand and model. Tell us about recent dirt road trips and anything you tow.