Need Help?

Contact our service department for the maintenance and repairs you need to stay on the road. Be sure to ask about training for your technicians and drivers.

Contact Service


Service Tip for May 2023
Mixing Coolant

We have all heard that you are not supposed to mix coolant in your engine. Well guess what, it's true! Mixing coolant brands may lead to a condition called electrolysis. Contrasting additives in different brands can react negatively and start to wear away the coolant passaged in your engine and radiator. If coolant must be mixed in a tight situation, make sure to drain and fill your system with a single brand as soon as possible.

  • Never mix coolant brands
  • If using coolant concentrate, mix with water BEFORE filling vehicle
  • Always use distilled water when mixing


Service Tip for April 2023
Cabin Air Filter Replacement

There is not much worse than getting into the warm season and finding out your trucks A/C is not blowing cold. While most A/C failures are related to refrigerant leaks, a less common but more expensive failure is a plugged evaporator core. The only way to keep this from occurring is keeping a clean cabin air filter installed in your truck. These filters are cheap and easy to replace, but easy to ignore and forget about in your day to day work life. Its best to include a cabin air filter replacement as part of your regularly scheduled maintenance to help keep you cool all summer long.

  • Request replacement during services (not regularly included in a service)
  • Change after driving through exceptionally dusty conditions
  • Some trucks are easy for driver to replace on their own


Service Tip for March 2023
Changing the Oil in Your Differential

Just like any oil, differential oil degrades with time and use. While your differential is not a regularly changed component, neglecting to service your differential may lead to premature failure and a large replacement bill. Differential services are quick, inexpensive, and a simple way to keep your drivetrain reliable. Refer to your operator’s manual for recommended service intervals.

  • Always change oil when wheel bearings or races are replaced
  • Never completely submerge axles in water
  • Never mix diff oil viscosities


Service Tip for February 2023
Valve Adjustments

Engine valve adjustments are an often-overlooked part of your truck’s health. While not a frequently needed service, as your engine ages, a needed tune up may not present with an audible misfire. You may start to notice poor fuel economy, low power, or even more frequent regens needed. Most engines are recommended to have a valve adjustment performed every 100,000-150,000 miles (or less depending on engine operating conditions). A tune up is just a simple way to help get the most life and dependability from your truck.

The following are indications of a possible valve adjustment needed.

  • Poor fuel economy
  • Misfire
  • Frequent regens


Service Tip for January 2023
Diesel Particulate Filter Regeneration

Parked and passive regens are a critical part of your engine’s health. While some trucks may have a “regen inhibit” switch installed, it is critical to not overuse this feature. Not allowing your truck to perform a regen may lead to catastrophic aftertreatment system damage.

  • Limit city driving as much as possible. Low speed and stop-and-go drive cycles do not allow the vehicle's exhaust to get hot enough to passively regenerate and will require more frequent parked regens.
  • Drive the truck at freeway speeds for at least 20 minutes a week. This will allow the truck to passively regenerate and clean off some of the built up soot in the DPF.
  • If a driver is not familiar with how the regen system works, under the drivers side visor, there is information explaining the lights on the dash and warnings about running parked regens.

If you are concerned about the health of your system, Peterson can perform an inspection to make sure temperatures and soot loads are where they need to be to keep you on the road.