oil being poured into a funnel

Oil changes are integral to the performance, longevity, and reliability of your diesel truck. At Harold's Used Auto Parts Inc in Philadelphia, our expert mechanics understand the importance of good quality oil, changed at correct intervals, in allowing you to get the most out of your Cummins, Powerstroke, or Duramax diesel.

At Harold's Used Auto Parts Inc in Philadelphia, PA, we know there’s a lot of conflict on when you should maintain certain things on your truck. We also know there are consequences to neglecting maintenance; the difference between a truck that breaks down all the time and a truck that has covered over a million miles virtually trouble-free all boils down to maintenance.

inside of a transmission

At Harold's Used Auto Parts Inc in Philadelphia, PA, we’ve seen and diagnosed every warning light in the book. Many people ignore their check engine light, and while it isn’t advised, often get away with it. Transmission warning lights are different, however. Here's what it means and what you should do when it comes on.

man putting gas in a vehicle at the pump

Like anything else on your vehicle, keeping various systems clean and in good shape is essential to long life and reliability. Your fuel system is especially important - parts are expensive, problems can be difficult to diagnose, and it doesn’t take much contamination to cause a huge issue. It’s much easier to keep your fuel system clean than it is to clean a dirty or problematic system. Performing regular fuel treatment can prove very beneficial to the life of your vehicle.

fuel being put into vehicle

Your car’s fuel system works with the rest of the engine control system to deliver the best performance with the lowest emissions. Check your car’s fuel system regularly or immediately if you smell gas or suspect a problem.

What does it do? - The fuel system transfers fuel from the fuel tank and passes it through a fuel filter for straining before it arrives at the injectors. A pressure regulator controls fuel pressure to ensure good engine performance under a variety of speed and load conditions. Fuel injectors, when activated, spray a metered amount of fuel into the engine. Some vehicles use a return line system to return unused fuel back to the tank.

Battery

At Harold's Used Auto Parts Inc in Philadelphia, we understand how vital solid battery power is to a truck driver. A dead or weak battery isn’t a big deal in a passenger vehicle; in a commercial truck, missed deadlines, incomplete jobs, insufficient equipment, and inconvenient situations are all consequences of a less than adequate battery.

mechanic working under the hood of a car

Transmissions are complicated and intricate pieces of equipment. Many general mechanic shops won’t touch a transmission, if it’s anything more than simply installing a new one. Transmissions are one aspect of a vehicle that even experienced mechanics often don’t dare delve into, and is easily the most mysterious and misunderstood system in the automotive world. You need a shop that you can trust to perform the best work on whatever your transmission may be in need of. 

Some of you may have experienced poor quality work done to your vehicle, which may have ended damaging your car worse or left you feeling uneasy. At Harold's Used Auto Parts Inc in Philadelphia, PA, we understand the importance of high-quality service and repairs which is why we strive to be the best. Here are examples of why it makes a difference, no matter what type of car, truck, or SUV you drive.

  • Jasper
  • Acdelco
  • ASE
  • Auto Zone
  • Berrodin
  • BF Goodrich
  • Bosch Automotive
  • Bridgestone Firestone
  • Cooper Tires
  • Customer Savings
  • Dunlop Tires
  • Fleet Services
  • Goodyear
  • Handicap Accessible
  • Hankook Tires
  • JASPER Marine
  • Kelly Tires
  • Michelin
  • Mastercraft
  • Motorcraft Parts
  • Pet Friendly
  • Radiator
  • State Inspection
  • Sumitomo Tires
  • Tires
  • Towing
  • Toyo
  • Uniroyal
  • 12 Month Warranty
  • Wifi Available

5347 Whitby Ave
        Philadelphia, PA

(215) 472-1552
Email the Shop
MON-FRI | 8:30 AM - 5:30 PM
SAT | 8:30 AM - 2:00 PM
SUN | CLOSED
Closed every third Saturday of the month