← Back to Blog
PartsJuly 2026

OEM VS AFTERMARKET PARTS: WHAT WE ACTUALLY RECOMMEND

The honest answer isn't always "buy OEM." After 20+ years fitting parts across every brand imaginable, here's how we actually decide — and when cheap parts cost you more in the long run.

What OEM Actually Means

OEM stands for Original Equipment Manufacturer. An OEM part is made by or for the brand — Honda air filter for a Honda engine, Husqvarna blade for a Husqvarna mower. It's designed to the original spec, with the right dimensions, materials, and tolerances.

Where OEM Is Worth Paying For

  • Carburettor components: Float valves, jets, and gaskets need to be exactly right. A generic carby kit with slightly wrong dimensions will cause problems immediately.
  • Ignition modules and coils: Cheap ignition components fail quickly and inconsistently — hard to diagnose, hard to trust.
  • Blades on quality machines: For high-end ride-ons (Husqvarna, John Deere), blade balance and steel grade matter for cut quality and deck longevity.
  • Warranty repairs: We use OEM parts for warranty work — full stop.

Where Aftermarket Is Perfectly Fine

  • Air filters: A quality aftermarket air filter (not no-name, but a known brand) works just as well at half the price. We stock these and use them in our own services.
  • Spark plugs: NGK and Champion are aftermarket options that are equal to or better than OEM in most applications.
  • Fuel filters: Inline fuel filters are a commodity part. Brand doesn't matter — spec does.
  • Belts on older machines: If the machine is 10+ years old, genuine belts may not even be available. Quality aftermarket is the practical answer.

What We Tell Our Customers

We always tell you which parts we're using and why. If there's a quality aftermarket option that saves you $30 with no performance penalty, we'll use it and tell you. If the OEM part is the only one we'd trust for that application, we'll tell you that too — and explain why.

We don't upsell. We use the part that makes the job right.

NEED A PART? CALL US FIRST.

We stock a range of common parts and can advise on OEM vs aftermarket for your specific machine.

Call Billy  Parts Shop