Oil & filter change
Conventional, synthetic blend, or full synthetic — with a look underneath while the car is on the lift.
We Take Out The Frustration From Your Auto Repair Experience
Auto Repair You Can Trust
Schedule an AppointmentWe’re in the people business, and people drive cars.
Finding a trustworthy auto repair shop can feel like an impossible task. At Watertown Mutual, we focus on integrity and place a high value on educating our customers, saving you from frustration and giving you an auto repair experience you can trust.
Schedule an AppointmentOur services
What we do most.
Brake repair
Pads, rotors, calipers, lines, and fluid. If the pedal feels wrong, bring it in before it gets worse.
Check engine diagnostics
We read the code, then find the cause. A code tells you where to look — not what to replace.
Two counters, two clocks
The pumps and the bays keep different hours.
We're a gas station and a repair shop at the same address, so it's worth knowing which one you need before you drive over.
Repair Shop & Inspections
Service bays
- Monday – Friday
- 8:00 am – 5:00 pm
- Saturday
- 8:00 am – 2:00 pm
- Sunday
- Closed
State inspection stickers are first come, first served. Come early on Saturdays — the line builds fast.
Gas Station
Pumps
- Monday – Saturday
- 6:00 am – 9:00 pm
- Sunday
- 8:00 am – 9:00 pm
- Air & fill-ups
- All open hours
Regular, mid-grade, premium, and diesel. Early drop-off is available before the bays open.
Why people keep coming back
You've probably left a shop feeling like this.
- Handed an estimate full of line items nobody offered to explain.
- Told a repair was urgent, with no way to judge whether it was.
- Left without a car for three days over a job that should have taken one.
- Charged dealer prices for work a neighborhood shop does every week.
None of that is inevitable. It's just what happens when a shop treats you as a transaction instead of a neighbor who'll be back in six months.
You get a call with what we found, what it costs, and what happens if you wait. Then you decide. Nothing gets done that you didn't approve.
Plenty of shops replace whatever part the scanner points at. If you've got a noise nobody can place, a light that keeps coming back, or a dealer estimate that doesn't add up, that's the work we like most. And if a job genuinely belongs somewhere else, we'll tell you where to take it.
We're a licensed Massachusetts safety and emissions inspection station, open for stickers Monday through Saturday. No appointment needed — it's first come, first served, and most people are out in well under half an hour.
Remodeled, with free Wi-Fi, a TV, and a coffee bar. If you'd rather not wait, Coolidge Square is right outside the door — breakfast, lunch, and a bakery all within a block.
We've been the shop on Mt. Auburn Street for more than 25 years. The techs have seen most problems before, and there's almost always a lift free when you need one.
About us
Same corner, same family, same answer when you call.
For more than 25 years we've been the shop on Mt. Auburn Street — a family-owned business that fills tanks, writes inspection stickers, and rebuilds brakes for the same customers year after year. Some of them have been coming since they were kids in the back seat.
The reason is simple. Honest advice, work that holds up, and a service manager who picks up the phone. That's the whole model, and it hasn't needed changing.
From our customers
Twenty-five years of honest service.
★★★★★“I go to Watertown Mutual to Paul for all of my car's mechanical problems.
Marilyn D.Yelp review, April 2021
Paul is very honest, and gives you the BEST price for the repair. I will continue going there for all of my car needs.
Paul is Awesome!”
★★★★★“Paul and everyone are just great -- honest, hard-working, know a lot about cars, and repair them well. And, they go the extra mile. Many times over the years, they have helped me keep my old car on the road.”
Jed. P.
★★★★★“Best place around for sure!!
Dave M.Yelp review, May 2025
I get all my repairs here. Like everyone says: Paul is such an decent honest guy. Totally trustworthy mechanic in a sea of other less- trustworthy crooks. Always gives me a fair price, never does extra work I dont need.... fixes the problems correctly the first time. And very accomodating too.”