It's one of the most common questions we get: "Should I buy OEM or aftermarket parts for my kei truck?" The honest answer is that both have a place — and knowing when to reach for each one saves you money without gambling on a bad part. Here's the plain-English breakdown for Subaru Sambar, Honda Acty, Suzuki Carry, Daihatsu Hijet and Mitsubishi Minicab owners.
What "OEM" actually means
OEM stands for Original Equipment Manufacturer — it's the genuine part, made to the exact spec the factory used when your truck was built (often by the very same supplier). The upside is obvious: guaranteed fit, known quality, and the right materials for that application. For a decades-old Japanese kei truck, that peace of mind matters. The trade-offs are that OEM parts usually cost more, and for some older models certain genuine parts are simply getting harder to find as they're discontinued.
What "aftermarket" actually means
Aftermarket parts are made by companies other than the original manufacturer. Quality ranges widely across the industry — but good aftermarket parts, made by trusted Japanese brands, are excellent value and often identical in function to OEM. Many wear items (filters, belts) are actually produced by the same big-name suppliers who feed the factories. The upside: lower cost and better availability, which is a lifesaver when a genuine part is discontinued. The catch: quality really does depend on the brand, so who makes it matters.
Our take: buy the right one for the job
We stock both, and we only carry aftermarket from reputable Japanese makers — so you're never rolling the dice. Here's the rule of thumb we'd give a friend:
- Routine wear items → quality aftermarket is a smart buy. Oil, air and fuel filters and accessory belts from trusted brands do the job for less. These get replaced regularly anyway.
- Fit-sensitive or "do it once" parts → OEM is often worth it. Gaskets and seals and precision ignition components are cases where an exact factory fit pays off — you don't want to pull the same job apart twice.
- Discontinued genuine part? Aftermarket saves the day. When OEM is unavailable for an older Sambar or Carry, a quality aftermarket equivalent keeps your truck on the road.
Don't overthink it
The biggest mistake isn't picking OEM vs aftermarket — it's buying a cheap, no-name part to save a few dollars and having it fail early. Whether you go genuine or aftermarket, buy from a source that stands behind the brands it sells. That's the whole game.
Not sure which part fits your truck?
This is where we earn our keep. Send us your chassis number (like KV3, HA4, DD51T, S110P or U62T) or a photo of the ID plate at scott@keiimportparts.com and we'll confirm the exact right part — OEM or aftermarket, your call. New to reading your codes? Our chassis-number guide shows you where to look. Ready to shop? Browse Sambar, Acty, Carry, Hijet and Minicab parts — genuine and aftermarket, imported from Japan and shipped fast from our USA warehouse.