When your vehicle needs attention and you want a shop you can actually trust, Promex Auto and Tire is worth the drive. We’re located at 31 Elm St in Newport, NH, and drivers from Enfield and the surrounding area have been making that trip for years. Honest, dependable auto repair is hard to find, and when you find a shop that does it right, it’s worth going a little out of your way.
From weekend anglers on Mascoma Lake to families riding the Northern Rail Trail and skiers heading up to Whaleback Mountain, Enfield is a town built around getting outside and putting miles on your vehicle. That kind of active, outdoor lifestyle means your car, truck, or SUV takes a beating year-round, through mud season, lake-town summers, and snowy winters alike.
Promex Auto and Tire has been part of this same close-knit Upper Valley community since the late 1980s, which means we understand exactly what local driving conditions do to a vehicle, and what it takes to keep one running safely through all of it.
One of the most common issues we see across Subaru models is head gasket wear, often showing up as coolant loss, overheating, or a sweet smell under the hood. Catching it early with routine inspection can prevent a much bigger repair down the road.
A leading cause of an illuminated check engine light is an EVAP system leak. Using our Snap-On engine scanner and dedicated EVAP leak machine, we pinpoint the exact source instead of guessing, so you get an accurate diagnosis and a real fix.
New Hampshire’s frost heaves, potholes, and rough seasonal roads take a toll on suspension components over time. We inspect and repair only the parts your vehicle actually needs, so you’re not paying for work that isn’t necessary.
Skipping routine maintenance is one of the most common ways small issues turn into expensive repairs. Staying on a regular schedule, including synthetic oil service at 5,000-mile intervals, helps catch problems early before they become costly.
As summer temperatures rise, weak airflow or warm air from the vents is one of the most common complaints we hear. We inspect and service A/C systems to restore reliable cooling.
We’re a full-service shop. Whether you’re coming in for routine maintenance or something more serious, here’s what we handle:
From a stubborn check engine light to a noise you can’t place, we track down the actual cause using real diagnostic equipment, not guesswork.
Battery, alternator, starter, or wiring trouble, we find the source and get your vehicle starting and running the way it should.
Scheduled upkeep that catches small problems before they become expensive ones.
Conventional and synthetic oil changes. We recommend synthetic service at 5,000-mile intervals.
We replace worn rotors rather than turning them, for a safer, longer-lasting result every time.
Rough roads and seasonal driving wear suspension components down. We repair only what your vehicle actually needs.
We sell and install tires suited to your vehicle and the roads you drive.
Our Hunter alignment machine delivers precise, calibrated alignments after potholes, curbs, or gradual drift.
We service both A/C and heating systems, so your cabin stays comfortable whether it’s a July heat wave or a January cold snap.
From diagnostics to engine replacement, depending on what your vehicle needs.
We handle transmission swaps and replacements. For full rebuilds, we partner with a trusted local transmission specialist.
Reliable upkeep for local business fleets, so your work vehicles stay dependable and on the road when you need them.
Backed By A Warranty
Our work is backed by a 3-year/36,000-mile Nationwide warranty, so you’re not left holding the bill if something isn’t right.
Honest Recommendations
We only recommend the repairs your vehicle actually needs for safe operation. No upsells, no surprises.
Specialized Equipment
The Hunter alignment machine, Snap-On engine scanner, and evap leak machine mean accurate diagnostics, not guesswork.
Early Bird Drop Off:
Use our key slot to drop your vehicle before we open, so your schedule doesn’t have to bend around ours.
Community Rooted in Newport
We’ve been part of this region since the late 1980s. We support local youth sports in Newport because we live here, too.
Enfield is a small Upper Valley town built around the outdoors. Mascoma Lake draws sailors and anglers, the Northern Rail Trail offers scenic hikes and bike rides, and Whaleback Mountain brings locals out in the winter for skiing and snowboarding. It’s a close-knit community where trust is earned through consistency, a standard Promex Auto and Tire has held itself to since the late 1980s.
That same standard extends well beyond Enfield. Families and drivers from Newport, Grantham, Sunapee, Newbury, Claremont, and Goshen make the trip to 31 Elm St for the same reason: honest recommendations, accurate diagnostics, and full-service repair, no matter which corner of the Lake Sunapee area you’re coming from.
Enfield is roughly 35 minutes from our shop at 31 Elm St in Newport via I-89 South to NH-11 West. It’s a straightforward drive, and most of our Enfield customers say the trip is worth it.
We work on most makes and models, including Asian, domestic, and European vehicles. If you drive a Honda, Subaru, Toyota, Ford, Chevy, or most other brands, we can help. We don’t service exotic vehicles or perform body work, glass repair, or performance tuning.
We frequently see Subaru head gasket wear and EVAP system leaks that trigger the check engine light. Both are diagnosed accurately with our specialized equipment rather than guessed at.
Yes. We have a key slot at the shop for early bird drop-offs, so you can leave your vehicle before our doors open at 8 a.m. and get on with your day.
Call us at 603-863-2704 to set up a time. We prefer drop-offs and keep a limited number of wait slots available each day.
If you’re in Enfield or anywhere along the Mascoma Lake corridor and need a shop that treats your vehicle like their own, Promex Auto and Tire is ready to help. We’re at 31 Elm St, Newport, NH 03773, about 35 minutes down I-89 South to NH-11 West.
Call 603-863-2704 to schedule your appointment, or use our early bird drop-off if mornings are tight. Honest service, accurate diagnostics, and work we stand behind. That’s what Enfield drivers will find at Promex.
