Serving Rapid City, SD and the Surrounding Areas

RNJ Auto Inc - Logo Engine repair Head gaskets Auto repair

Ultimate engine repair services

Could your car's engine use some work? Depend on the auto repair professionals at RNJ Auto Inc to handle your important engine replacement and repair projects. Ask for a FREE estimate.

  • Intake gaskets

  • Head gaskets

  • Timing belts

  • Water pumps

Make important engine upgrades

Did you know that we will service and repair vehicles with either diesel or regular gas engines? You will appreciate our competitive prices on auto parts and low labor rates.


Visit us for drivetrain repairs, chassis repairs and electrical repairs. Rely on a family owned and operated shop.

Complete engine repair center

Call ahead for faster service availability.


Trust a shop serving the area for 6 years and with 16 years of auto repair experience.