Subaru Service & Repair in Monrovia, CA
Expert Care for Your Subaru — Backed by Real Technicians and Real Customer Service
At Seiko’s Auto Service, we understand Subaru drivers. Your Subaru is built for reliability, capability, and long-term value — and it deserves a shop that knows how to keep it that way. Our team services Subaru vehicles every day, from routine maintenance to complex diagnostic and electrical issues.
At Seiko’s Auto Service, we don’t just “work on Subarus.” We specialize in keeping them reliable for the long run.
Why Subaru Owners Trust Seiko’s Auto Service
✓ High-level knowledge
Our technicians work with Subaru vehicles constantly — Forester, Outback, Crosstrek, Impreza, Ascent, WRX, and more. They are required to attend classes to keep up to date.
✓ Transparent communication
You’ll understand what your vehicle needs and why. No surprises. No repairs without authorization.
✓ Data-driven diagnostics
Modern Subarus rely heavily on electronics and networking between modules. We use advanced diagnostic tools to pinpoint the actual issue, not guess.
✓ A customer experience designed around you
Easy communication, helpful updates, digital inspections, and a friendly team that treats you like a person, not a transaction.
Common Subaru Services We Perform
Routine & Preventative Maintenance
- Oil services (Full Synthetic oils that meet specifications)
- Fluids, belts, filters
- Battery testing & replacement
- Scheduled maintenance by mileage, age, or condition
Subaru-Specific Concerns We See Often
- CVT transmission performance issues
- Head gasket concerns on older models
- Oil consumption diagnosis
- Wheel bearing noise
- Oil contamination in coolant
- Suspension wear (control arm issues)
- Electrical and sensor faults
- AWD system maintenance
Diagnostic Services
- Check engine light
- ABS & traction control warnings
- Airbag/SRS warning lights
- Network communication faults
- Drivability issues
- Cruise control warning light
Repairs and Services
- Engine repairs (reseal timing covers and cam carriers)
- Transmission services (Including CVT)
- Cooling system repairs (leaks from the engine)
- Brake systems (electronic parking brake systems)
- Steering & suspension (bushings and ball joints)
- A/C and heating systems (R134a and R1234yf)
Our Goal With Every Subaru
To help you build a long-term relationship with your vehicle.
We want your Subaru to stay reliable, safe, and enjoyable — whether it’s taking you to work, the mountains, or on a family trip.
What to Expect When You Visit
- Friendly, honest check-in
- Thorough evaluation and digital inspection (photos of your vehicle)
- Clear explanation of findings
- No-pressure recommendations (we educate on the recommendations)
- Quality repairs backed by experience and an industry leading warranty (3 year/36k mile nationwide)
- A team who cares about you and your vehicle
- Convenience (Local shuttle, ride share, loaner vehicles available)
Serving Monrovia, Duarte, Arcadia & Surrounding Areas
If you’re looking for Subaru experts who communicate clearly and respect your time, we’re here for you.
Subaru Upper Oil Pan O-ring
Does your Subaru have oil contaminating the cooling system in your Subaru? Common signs are oil floating on the top of the coolant in the reservoir, swollen upper radiator hose, leaking radiator from the top tank, and possibly the upper radiator hose popping off while driving the vehicle causing steam from under the hood. This can lead to overheating and damaging the engine.
The expert technicians at Seiko’s Auto Service in Monrovia CA can help identify if your Subaru is experiencing this fault. They can also help with the repair of your Subaru’s engine. The fault lies in the 3 O-rings in the upper oil pan that loses its elasticity due to carbon and sludge build up. This is caused by not performing the engine oil service every 5k miles or every 6 months whichever comes first. We also offer an additive for the engine oil. The BG MOA (Motor Oil Additive) helps fortify the oil that helps the piston rings from stick, reduces internal wear, prevents sludge and varnish build up, and helps with evaporation of the engine oil.
The process for repairing the oil contamination is invasive and extensive that requires that engine to be removed from the vehicle. During repair our expert technicians will disassemble the engine and inspect key components, clean all the removed components, replace seals, gaskets, PCV (Positive Crankcase Ventilation) parts, and reseal the engine using the proper techniques. After the repair your Subaru’s engine will run like new, helping you save money in the long run so you do not have to buy a new vehicle and have monthly payments. During the repair we can make it convenient by providing you with a loaner vehicle so you can continue to go on with life without disruptions.
If you love your Subaru and want to give it another chance at life, let the expert technicians at Seiko’s Auto Service help you fall in love with your Subaru again. We are here to “Help you build a relationship with your vehicle” in Monrovia, Duarte, Arcadia, Pasadena, Sierra Madre, and the surrounding San Gabiel Valley area.