I manage parts procurement for a 40-person HVAC service company in the Midwest. Over the past seven years, I've handled roughly $240,000 in annual parts spend, negotiated with 15+ vendors, and documented every order in our cost tracking system. Tecumseh parts are a steady line item on that budget.
Take the tecumseh air filter 30727. It looks like the most boring part in the world—a small foam filter that fits a wide range of Tecumseh OHS and OHH engines. If you own a tecumseh snow blower from the last couple of decades, there's a strong chance this exact filter is what it takes. And if you've shopped for it, you've probably noticed the same thing I did: the genuine Tecumseh part runs $9 to $12, while aftermarket versions cost $4 to $7.
I'm a procurement guy at heart, so my first instinct is to respect that $5 difference. But after tracking these filters across our fleet and customer equipment through two full winters, I've come to a conclusion that surprised me: the cheaper filter costs more. Here's the comparison that got me there, and how I'd think about it if you're buying for your own Tecumseh snow blower.
To compare them fairly, I looked at four things: unit price, cost per season, fit and seal, and where to buy. The first one gets all the attention. It's also the least useful number.
What the Unit Price Actually Says
I checked current pricing in January 2025. Genuine Tecumseh 30727 filters list around $12 to $14, but real dealer pricing at PartsTree or Jacks Small Engines lands closer to $9 to $11. Aftermarket versions on Amazon sit mostly between $4 and $7, and some multi-packs go even lower per filter. On this dimension, aftermarket wins by a mile. Fifty percent cheaper is hard to argue with when you're staring at an invoice.
Except that's the number manufacturers compete on, because it's the one that shows up on the price tag. It's not the number that determines what you'll spend.
The Number That Changed My Mind: Cost Per Season
Two winters ago, I started tracking filters the way I track everything else: part number, vendor, unit cost, hours run, date replaced. I wanted actual data on whether the cheap filter was actually cheap. I did not expect the answer to be so lopsided.
The OEM 30727, cleaned and re-oiled at the start of each season, held up for two to three seasons. The aftermarket filters, given the same treatment, mostly went stiff and started crumbling around the edges after one. I want to say we had a single aftermarket filter make it through a second winter, and its seal was already questionable by then.
Run the numbers and it's brutal for the aftermarket side:
- OEM 30727 at $10, lasting two to three seasons: $3.50 to $5 per season
- Aftermarket at $5 to $6, lasting one season: $5 to $6 per season
The "cheap" filter is a 40% premium per season, with worse protection the whole time. If I brought that spreadsheet to our finance team, they'd question why I bought the cheap ones in the first place.
To be fair, not every aftermarket filter is the same. I don't have lab-tested efficiency numbers on what's out there, and I don't want to pretend I do. But based on what I've seen across 30+ Tecumseh engines over two winters, the common $5 Amazon filters are not in the same quality category. The foam density alone tells you that.
Fit, Seal, and a $400 Lesson
When I held an OEM 30727 next to an aftermarket universal filter for the first time, I finally understood why the details matter. The genuine part has a molded shape and a beveled edge, and it seats into the filter housing in one specific orientation. The aftermarket one was, more or less, a rectangle of foam with a hole in it.
On a snow blower, that filter is the only barrier between the carburetor and everything the impeller throws into the air. A poor seal means dirty air gets pulled in. Dirty air means grit in the cylinder. Grit in the cylinder means scored walls, and scored walls mean a seized engine.
I learned this the expensive way. A vendor offered me bargain filters at something like $3.25 each, and I took the deal to shave a few dollars off a seasonal order. That filter went on a customer's snow blower. It failed mid-season, the engine seized, and we had to replace the power head. The replacement ran us roughly $400. The OEM filter that would have prevented it costs $10. I spent $400 to avoid spending $10, and the customer still remembers the downtime.
Don't be me on this one. I should add that our senior tech had warned me for years about cheap air filtration. I didn't listen because I was chasing a budget target. The budget target was fine. The engine wasn't.
An informed customer asks what something costs per year, not what it costs today.
Where to Buy the Tecumseh 30727 Without Overpaying
Sourcing matters as much as the part itself. As of January 2025, here are the places I actually buy from and what I've seen:
- PartsTree — genuine Tecumseh stock, good cross-reference data, OEM 30727 priced around $9 to $11
- Jacks Small Engines — same ballpark pricing, occasionally better shipping rates
- Power Equipment Outlet — reliable for genuine Tecumseh parts, decent stock depth
- Local small engine dealers — the fastest option for the real part if you have one nearby
Aftermarket sources are mostly Amazon, eBay, and Walmart marketplace. They're cheaper and they ship fast—no argument there. The risk is quality, and with a foam filter you can't judge quality from a listing photo.
One sourcing trap worth naming: shipping. A $5 aftermarket filter with free shipping is genuinely $5. An $11 OEM filter with $8 shipping becomes $19. That gap is real. My workaround is to order OEM filters in small bulk—three or four at a time—which spreads the shipping cost across multiple parts and brings the per-unit price back to competitive.
This pricing was accurate as of January 2025. Prices shift around in this industry, so verify current rates before you commit.
The Same Logic, Bigger Numbers: Heat Pump Dryers
It might seem like a tangent, but the same reasoning applies to a product line we're seeing more and more of in commercial service: heat pump dryers. Many heat pump dryers use sealed refrigeration loops with Tecumseh compressors. When a compressor fails, the repair involves recovering refrigerant, unbrazing and rebrazing lines, evacuating, recharging, and reassembling the unit. Most of that is labor, and labor costs the same whether the part was $180 or $260.
So when a tech proposes a "cross-reference" compressor or aftermarket start relay to save $80, I don't just approve it. I do not approve substitutions unless the spec sheet checks out. A $200 compressor that fails in 18 months costs far more than a $260 one that runs for ten years, once you count labor, refrigerant, and a customer who has to deal with a second failure. Same lesson as the air filter, just with bigger numbers.
So: OEM or Aftermarket?
Here's the practical breakdown, the way I'd give it to a customer or one of our techs:
If you're a homeowner with an older Tecumseh snow blower and you just want dependable starts through the winter, buy the OEM 30727. It costs $5 more, it'll last two to three winters, and you'll never think about it again.
If you're in a bind on a Saturday and the only thing available is a universal foam filter, you can make it work for a season. Trim it carefully, oil it properly, and check that it seats fully in the housing. Just don't treat that as the long-term plan.
If you're maintaining equipment commercially—Tecumseh snow blowers in your fleet, heat pump dryers with Tecumseh compressors in your service area—the genuine part is the winner. It isn't close. The labor, downtime, and callback risk all dwarf the unit price difference. Seven years of invoices back that up.
An informed customer is the best kind of customer, and the first question isn't "what does this cost?" It's "what does this cost me per year?" That question would have saved me $400.
