Frequently Asked Questions

Most diesel trucks need oil changes every 5,000 to 15,000 miles depending on usage, engine type, and oil quality. Heavy-duty operations or severe conditions may require more frequent intervals. At Sub Zero Diesel Performance, we use advanced oil analysis to determine the optimal schedule for your specific truck and operating conditions.

A thorough diesel maintenance inspection covers engine fluids, filters, belts, hoses, brake systems, and potential problem areas. It also includes setting up a customized PM schedule based on your truck's usage patterns. At Sub Zero Diesel Performance, we tailor inspections to prevent breakdowns before they occur.

Rebuilding makes sense when the engine block and major components are still sound but internal parts are worn. It's typically more cost-effective than replacement and can include performance modifications. Motor rebuilds also allow for custom machine work to improve durability and power output.

Synthetic oils provide superior protection in extreme temperatures, resist breakdown longer, and improve fuel efficiency. They're especially valuable in North Dakota's harsh winter conditions where conventional oils can thicken. High-quality synthetics also extend drain intervals and reduce engine wear during cold starts.

Advanced oil analysis detects metal particles, contaminants, and breakdown products that indicate engine wear or problems. It helps identify issues before they cause failures and optimizes oil change intervals. This diagnostic approach saves money by preventing unnecessary services while catching problems early.

Professional diesel diagnostics use computerized scanners, pressure testers, and specialized software to read engine codes and performance data. These tools accurately pinpoint fuel system issues, sensor failures, and compression problems. At Sub Zero Diesel Performance, we use advanced equipment to diagnose issues other shops might miss.

Automatic lubrication systems deliver precise amounts of grease or oil to chassis points, bearings, and joints on a timed schedule. They eliminate manual greasing, reduce wear, and extend component life. These systems are especially beneficial for fleets and heavy-duty operations with frequent use.

Skipping preventive maintenance is the costliest error diesel truck owners make. Neglecting scheduled services leads to breakdowns, expensive repairs, and lost productivity. Setting up and following a customized PM schedule based on actual usage prevents most major problems and extends vehicle life significantly.

Yes, modern fleet maintenance programs use AI-powered remote asset health monitoring to track vehicle conditions in real time. These systems alert managers to potential issues, schedule maintenance automatically, and reduce unexpected downtime. At Sub Zero Diesel Performance, we offer comprehensive fleet programs with advanced monitoring technology.

Extreme cold in Bismarck and surrounding areas demands more frequent fluid checks, battery testing, and fuel system attention. Winter conditions thicken fluids, strain batteries, and can gel diesel fuel. Using proper cold-weather oils and maintaining heating systems prevents costly cold-start damage and breakdowns.

Hydraulic maintenance involves fluid cleaning, filter replacement, pressure testing, and inspecting hoses and seals for leaks or wear. Clean hydraulic fluid prevents component damage and maintains system efficiency. Regular service extends the life of expensive hydraulic pumps, cylinders, and valves on heavy equipment.

Brake diagnostics identify worn pads, fluid contamination, air in lines, and failing components before they compromise safety. Diesel trucks carry heavy loads that stress brake systems more than standard vehicles. Professional brake checks ensure stopping power meets safety standards and prevents accidents or costly emergency repairs.