For over thirty years, Harland’s Diesel Service has remained a family owned and family run operation. We are a full-service diesel facility. We provide Ponca City, OK, and the surrounding areas with quality mechanic service and reliable repair for heavy equipment. Over the years, we have stuck to the same principles of honesty and efficiency. Harland’s Diesel Service is your source for fast, routine preventative maintenance and reliable repair. When you need a diesel mechanic, give our truck repair shop a call!