“Family Owned and Operated”
Northside Auto & Truck Service | Truck & Auto Repair in Watertown, WI
Serving the Watertown, WI Area
Call Us Today • (920) 206-9434
Northside Auto & Truck Service | Truck & Auto Repair in Watertown, WI
Welcome to
Northside Auto
and Truck Repair
Shop Location:
(920) 206-9434
N1009 County Hwy L
Watertown, WI 53098
Shop Hours:
Mon - Thur 8:00AM - 7:00PM
Fri by Appointment Only
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“Customer Service Is Our Goal”
“Our work is guaranteed because hard feelings aren't easy to repair.”

About Northside Auto & Truck Service in Watertown, WI

The Northside Auto Crew
Northside Auto & Truck Service Crew

Northside Auto is a full-service preventive maintenance and auto repairs center in Watertown, WI, specializing in a range of auto repairs and services for cars, trucks, vans and fleets which include: heating and cooling, transmissions, electronics, internal engine, heavy-duty, towing, undercar and more.

Our experts have the knowledge and skills to service and repair even the most challenging auto problems on all makes and models of domestic and import vehicles. We use the latest technology to assess the situation and offer you alternatives. We guarantee all of our work and know you'll be happy with the outcome. Stop in or give us a call at (920) 206-9434 to let us know how we can help you today!

Meet Our Staff

John Mason, Owner of Northside Auto & Truck Service
John Mason
Owner/Certified Master Technician / Mechanic

John Mason grew up in Beaver Dam, Wisconsin, and has been around the automotive industry almost all of his life. In high school, he worked at the local gas station, gaining knowledge and hands on training at an early age. John then attended UTI in Chicago after high school, studying all areas of automotive.

Before opening his own business, John worked for a number of auto shops throughout the Watertown area including a Chevy dealership as an auto technician. After a few years, John felt he could take everything he had learned both in shop and in school and open up an auto shop of his own.

In 2000, John officially opened the doors to Northside Auto & Truck Service in Watertown, WI, working by himself at first and hiring employees along the way. Along the years, Northside Auto & Truck Service expanded to a full auto repair facility and has recently doubled in size.

Greg A. Nass, Master Technician at Northside Auto & Truck Service
Greg A. Nass
Master Technician

Greg A. Nass will be taking on service technician duties at Northside Auto Service on Hwy. L, just one mile north of Watertown. Greg brings over 19 years of automotive repair experience to Northside Auto. He graduated from Madison Area Technical College in December of 1995, and has had much updated training along the way. He is currently an ASE (Automotive Service Excellence) Certified Master Technician. Greg began his new position on Monday, August 26, 2013. John Mason, owner of Northside Auto said “Greg is known for being extremely Dependable, Knowledgeable and Honest. We at Northside Auto are very excited about him coming on board. He will be an asset to our operation and help us to deliver the highest quality customer service possible, as we expand our business.”

Ritchie Duncan, Master Certified Technician at Northside Auto & Truck Service
Kaleb Rippentrop

Kaleb grew up in the Wisconsin dells area. He has always had a very strong attraction to working on vehicles. He had done engine rebuilds and engine swaps in his high school years. He then went to North Carolina for college, there he got a job rebuilding salvage cars to pay for college tuition. Since then he has transferred colleges to Wisconsin. He has been working on cars here in the watertown area for three years. He is happy to be a part of the Northside Team!

Ryan Enerson, Assistant Service Advisor at Northside Auto & Truck Service
Ryan Enerson
Service Advisor

Ryan was born and raised in the Deerfield Wisconsin area. He has been working in the customer service industry since the young age of 16. With over 14 years of experience, including managing Valvoline in Madison, he is here to help make your experience at Northside Auto a great one!

Vehicles We Repair & Service:
American Cars, Trucks & SUVs European Cars, Trucks & SUVs Asian Import Cars, Trucks & SUVs
Land Rover
Mini Cooper