At Diesel Doctor, Inc. in Havre, MT, our goal is to get you back on the road quickly with precise repairs and friendly, efficient service. We specialize in diesel engine repair and can service the following trucks: Kenworth, International, Peterbilt, Mack, Western Star, Volvo, as well as transit buses, school buses, RV semi-trailers, tractors, and farming equipment. If you’re stuck in a bind and can’t make it to the shop, no problem! We offer 24-hour roadside assistance.