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Triangle Service Center

Average Score
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
5.0
(2,572 Reviews)
96
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Score Details

Last 30 Day Trend

Active Business

ReScore Reviews

ReScore
Overall Rating 0.0/5Overall Rating 0.0/5Overall Rating 0.0/5Overall Rating 0.0/5Overall Rating 0.0/5
Original Review
Overall Rating 0.0/5Overall Rating 0.0/5Overall Rating 0.0/5Overall Rating 0.0/5Overall Rating 0.0/5
0
Total ReScores
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ReScore Average
96
Net Promoter Score ®

Business Details

About

In 1978 with more than 10 years in the automotive repair field under his belt, David McAllister bought the gas station at the apex of Concord and Boston roads. During the initial land surveying it was noticed that the land configuration was indeed a perfect “Triangle.” The rest of the naming was easy, due to the variety of automotive In 1978 with more than 10 years in the automotive repair field under his belt, David McAllister bought the gas station at the apex of Concord and Boston roads. During the initial land surveying it was noticed that the land configuration was indeed a perfect “Triangle.” The rest of the naming was easy, due to the variety of automotive repairs planned during the future; the second half had to be “Service Center.” The site, more than three decades old, is now a landmark used by many to give directions to either Carlisle or to the Bedford area. Take a right at Triangle to go to Great Brook Farms in Carlisle or a left to go to the town soccer fields.

Today, Triangle is still family owned with David's son Peter McAllister manning the helm. We are proud of our heritage and even more proud of the service we have been able to provide through the years to the motoring public in the Chelmsford, Carlisle, Billerica, Westford, and the greater Lowell area.
...more

Categories
Auto Repair, Car Maintenance, Tire Sales and Repair
Contact
(978) 256-7658

Business Hours

Mon
7:00 AM - 5:00 PM
Tue
7:00 AM - 5:00 PM
Wed
7:00 AM - 5:00 PM
Thu
7:00 AM - 5:00 PM
Fri
7:00 AM - 5:00 PM
Sat
closed
Sun
closed
* Eastern Time (Us & Canada)
177 Boston Road Chelmsford, MA 01824-4615
Triangle Service Center's Reviews
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
5.0
(2,572 Reviews)

DT
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DONNA T.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/08/2025
verified customerVerified Customer
10
Oil filter change and inspection
My oil was extremely low. They didn’t have an appt available for a week. They were concerned and squeezed me in their very busy schedule. Always friendly and helpful.

TB
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TOM B.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/04/2025
verified customerVerified Customer
10
Great service
Triangle never disappoints with reliable, honest service. Our Cadillac was delivered on time and at the price that was quoted. I strongly recommend Triangle for all of you automotive service needs.

EP
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ERNEST / RENA P.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/02/2025
verified customerVerified Customer
10
Highway tow incident
My car lost an underside plate on the highway. It was towed to Triangle where it received prompt attention and diagnosis. As always, Triangle was reliable and honest. Much appreciate having them on my team!

PK
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PETER K.
Concord, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/02/2025
verified customerVerified Customer
10
Nice easy service visit
Great, complete anb no-nonsense service, kind and courteous front desk folks, very detailed notes on car's condition. Thank you!

Verified Customer
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/01/2025
verified customerVerified Customer
10
Reliable and trustworthy shop with advanced diagnostic capabilities.
Triangle Service Center successfully diagnosed and fixed a persistent winter problem with my car: a peculiar water leak from the roof rack directly into the electronic panels, which prevented the car from starting. They resolved the issue by refitting new gaskets and sealant to prevent any future leaks.

Since moving to the area, I've exclusively relied on Triangle Service Center for all my car's maintenance and repairs. Their service is consistently reliable and trustworthy.

Verified Customer
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
07/01/2025
verified customerVerified Customer
10
AC recharge
Had engine replaced earlier this year, Nicho is super responsive and the mechanics are great, would recommend to anyone.

MB
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MICHAEL B.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
06/28/2025
verified customerVerified Customer
10
Great people and service
Always a great experience with these folks!. Whether it’s something complex or as simple as an inspection, they are always friendly, professional and honest. I wouldn’t take my vehicle anywhere else.

LK
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LINDSEY / CLEVE K.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
06/26/2025
verified customerVerified Customer
10
Happy customer
Great communication, reasonably priced, and high quality work done.

GK
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GREGG / DEBBIE K.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
06/20/2025
verified customerVerified Customer
10
Always Great Service
Pleasant people to work with. Robin in the office always keeps you informed and is a pleasure to talk to.
Technicians do excellent work and get the job done when they say they will.
Highly recommend Triangle for all your automobile needs !

Verified Customer
Billerica, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
06/18/2025
verified customerVerified Customer
10
Mystery Squeeks
For months my new brakes kept squeaking but never in the shop, only in my driveway. An inspiration made me record on my phone the squeaking. Problem solved generously. These folks are the best!

MR
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MICHELE R.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
06/11/2025
verified customerVerified Customer
10
Fast and friendly service
As is usual, my car was serviced with a smile! You can always tell a lot about someplace by the way the employees treat each other. I witnessed a very kind, very supportive interaction. So, not only do they treat their customers well, they treat each other well.

BT
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BOB/LISSA/MIKE T.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
06/07/2025
verified customerVerified Customer
10
Another good visit
We have been going here for years. They were great then and they are great now.

KB
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KEVIN / LAURA B.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
06/04/2025
verified customerVerified Customer
10
Oil change and new tires
Triangle is the best. There’s really no need to go to any other auto technician. It’s family owned, they’re reliable are just good people.

DO
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DAVID / JOAN O.
Chelmsford, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
05/31/2025
verified customerVerified Customer
10
Love this place!
Oil change and problem with shuddering when accelerating. They fixe it! No more shuddering! I am so pleased!

JH
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JILL H.
Carlisle, MA
Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5Overall Rating 5.0/5
05/30/2025
verified customerVerified Customer
10
TRIANGLE is the best!!!
It is lovely to be warmly welcomed by name when I go to Triangle. Not only are they gracious but they are very competent and I know that they are going to handle any issues that I have with my van. They always let me know what they are keeping an eye on and charge fairly. The new email reminder and "we missed you" messages are very helpful. I look forward to dropping my van off to be assessed/fixed/stickered which is a rare feeling to have about a service station. Thank you Triangle!
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