CAT vs. Bobcat: Two Very Different Answers to "Who Builds the Engine in My Machine?"

Most contractors shopping a skid steer or compact track loader compare horsepower, lift capacity, and price -- not who actually built the diesel engine under the hood. But CAT and Bobcat answer that question in genuinely different ways, and the difference reflects two different corporate philosophies about engine sourcing that can matter when you're thinking about long-term parts availability and service.

CAT's Approach: Own the Engine Business Outright

Caterpillar's answer to "who builds the engine" is straightforward because Caterpillar largely builds its own. Most current CAT skid steers, compact track loaders, and other construction equipment run Cat-branded diesel engines designed and built within Caterpillar's own engine division. Caterpillar has also owned Perkins, one of the world's largest independent diesel engine makers, since 1998 -- a separate, wholly-owned subsidiary that builds engines both for Caterpillar's own equipment lines and under its own Perkins brand for other manufacturers entirely. We've covered the full history of that acquisition separately in why Caterpillar owns Perkins, including the engine's own C3.3B designation that shows up across several current D-series skid steer and compact track loader models. The practical upshot for a contractor: Caterpillar's dealer network services engines that Caterpillar itself designed, and the parts chain runs through Caterpillar from end to end.

Bobcat's Approach: Decades of Relying on an Outside Diesel Maker

Bobcat took a very different path for most of its history. For decades -- going back to at least the 1990s, according to longtime owners and technicians discussing older machines -- Bobcat sourced the diesel engines for much of its skid steer lineup from Kubota, the Japanese engine and equipment manufacturer that supplied compact diesels to a wide range of equipment brands during that era, not just Bobcat. Rather than building its own engine business the way Caterpillar did with Perkins, Bobcat built its machines around someone else's diesel.

The Shift Toward In-House Diesels, and an Honest Caveat

That changed, at least partially, somewhere around the 2014-2015 model years, when Bobcat began fitting its larger-frame skid steers and compact track loaders with Bobcat-branded diesel engines rather than continuing to rely exclusively on an outside supplier. Trade coverage from that period describes new 700- and 800-frame-size loaders shipping with what's specifically called a "Bobcat 3.4-liter diesel engine" built to meet Tier 4 standards without a diesel particulate filter -- a Bobcat-branded engine, not a badge-engineered Kubota unit. Here's the honest caveat: who actually manufactures that Bobcat-branded engine on Bobcat's behalf isn't something we found stated plainly in an official Bobcat source. Equipment-operator forums and parts discussions frequently describe these newer Bobcat-branded diesels as built by Doosan, Bobcat's parent company since 2007, as part of bringing engine production in-house rather than continuing to depend on Kubota. That's a plausible and frequently repeated account, and it lines up with Doosan's own position as a major heavy-equipment and engine manufacturer in its own right -- but it comes from forum discussion and secondhand technician accounts, not a Bobcat press statement, so treat it as reasonably well-supported rather than confirmed.

What the Perkins-Derived C3.3B Actually Means in Practice

On the CAT side, it's worth being concrete about what "Caterpillar's own engine business" actually looks like under the hood of a specific machine. Several current CAT D-series skid steer and compact track loader models -- including the 242D, 257D, 277D, 279D, and 289D -- run the Cat C3.3B, a 3.3-liter diesel. Caterpillar has owned Perkins outright since the 1998 acquisition, making Perkins part of Caterpillar's own engine manufacturing operation rather than an outside supplier in the way Kubota historically was for Bobcat. That distinction is the core of the philosophical difference between the two brands: Caterpillar folded an established third-party diesel maker into its own corporate structure decades ago, while Bobcat continued buying engines from an independent Kubota well into the following decade before shifting toward its own branded diesels.

How to Actually Check What's Under a Specific Machine

Whichever brand you're evaluating, the engine question is answerable with certainty for any individual machine -- you just have to ask the right source instead of assuming from the model name or frame size. A CAT or Bobcat dealer can pull the exact engine make and model tied to a specific serial number, and the engine itself typically carries its own manufacturer's identification plate or casting marks that a technician can read directly during a pre-purchase inspection. For a used machine, especially an older Bobcat skid steer where the engine supplier genuinely varied by model year and frame size, this is worth confirming before you finalize a purchase or financing decision -- not because one engine is wrong, but because knowing which parts network you'll actually be relying on changes how you plan for maintenance over the life of the machine.

A Mixed Lineup Today, Not a Clean Break

Bobcat's current skid steer and compact track loader lineup appears to run a mixed picture rather than a single clean answer. Larger-frame machines -- generally the S590 and up, and the equivalent compact track loader frame sizes -- are commonly described as running the newer Bobcat-branded diesel. Smaller-frame machines, including models in the S510 and S530 range, are frequently described by owners and dealers as still running Kubota diesels even in recent production years. If engine sourcing matters to your buying decision on a specific model, the most reliable path is to ask your Bobcat dealer directly which engine a specific serial number actually carries, rather than assuming based on frame size alone. For more on Bobcat's corporate structure generally, see our explainer on who actually owns Bobcat and where its equipment is built.

Why This Actually Matters to a Contractor, Not Just a Trivia Question

• Parts and service depth: Caterpillar's single-source model means CAT dealers are trained and stocked specifically around Cat-branded (and Perkins-derived) engines. Bobcat's mixed-supplier history means a dealer may need to stock parts and expertise for two genuinely different engine families depending on model and year.

• Resale and appraisal clarity: a machine's exact engine source can occasionally affect how confidently a used-equipment buyer or appraiser values it, particularly on older Bobcat models where Kubota parts availability and Bobcat-brand parts availability can differ by region.

• Rental and heavy-duty fleets running mixed brands often care more about this than a single-machine small contractor does, since fleet parts managers are the ones actually stocking filters, injectors, and gaskets across multiple engine families at once.

• A roofer or small subcontractor running one machine for its full service life rarely needs to think about this at all -- the dealer network behind either brand will service the machine regardless of who originally built the engine inside it.

Neither Approach Is Objectively Better

It's worth being clear that owning your own engine business, the way Caterpillar does, isn't automatically superior to Bobcat's historical approach of sourcing from an established outside diesel maker. Kubota built a well-regarded reputation for durability supplying compact diesels across the industry for decades, and relying on a specialist engine manufacturer let Bobcat focus its own engineering effort on the hydraulics, lift geometry, and operator experience that define a skid steer. Caterpillar's vertical integration gives it tighter control over engine development timing and emissions-compliance strategy, at the cost of carrying the overhead of running an entire separate engine business. Both are legitimate, different bets, and both brands have built genuinely durable machines under either model -- the engine-sourcing philosophy is a real difference worth understanding, but it isn't, by itself, a reason to rule either brand out.

Aging Kubota-Powered Bobcats Deserve Extra Attention at Resale

One practical wrinkle worth flagging for anyone shopping an older used Bobcat skid steer: machines built during the Kubota-sourced era are now well into their second decade of service, and that engine family's parts and service support runs through Kubota's own dealer network rather than Bobcat's. That's not a problem in itself -- Kubota maintains a substantial independent parts and service presence of its own -- but it does mean a shop or fleet manager used to working exclusively through a Bobcat dealer may need a second parts relationship to keep an older Kubota-powered machine running efficiently. A newer Bobcat-branded diesel, by contrast, stays inside the Bobcat dealer network end to end, the same way a Cat-branded engine stays inside Caterpillar's. Neither path is wrong, but it's a real maintenance-planning difference worth factoring into a used-equipment purchase decision, not just a historical footnote.

What This Means When You're Comparing Two Specific Used Machines

Put concretely: if you're cross-shopping a used CAT 262D skid steer against a similarly priced used Bobcat S650 from roughly the same era, the engine-sourcing history above is exactly the kind of detail that should factor into your decision alongside hours, undercarriage condition, and attachment compatibility. The CAT machine's engine lineage runs through Caterpillar's owned engine business from day one. The Bobcat's lineage depends on exactly when it was built and which frame size it is -- information you can and should pin down with the dealer before signing anything, financed or not. Treating engine sourcing as one more line item in your pre-purchase checklist, alongside the usual hour-meter and hydraulic-leak inspection, is a small step that can save a real headache three or four years into ownership.

A Different Lineup to Compare Against: CAT's Own D3 Series

If you're weighing a CAT machine specifically, it helps to know Caterpillar's current skid steer and compact track loader range is genuinely deep -- our buyer's guide to the CAT D3 Series' seventeen distinct skid steer and compact track loader models walks through the full lineup by size class, several of which run the Perkins-derived C3.3B engine referenced above.

Financing Either Brand the Same Way

None of this changes how equipment financing actually works day to day. Deposit requirements on a financed CAT or Bobcat skid steer or compact track loader still track credit profile -- strong credit can support $0-down structures, while thinner credit files more commonly see deposits in the 10% to 20% range, occasionally higher -- regardless of which engine supplier built the diesel under the hood.

Financing Your Next Skid Steer, CAT or Bobcat

BFC finances CAT and Bobcat skid steers and compact track loaders for contractors nationwide, whichever engine philosophy fits the way you run your fleet. For Bobcat-specific financing options, see our Bobcat loaders and equipment financing page.

Ready to Move Forward?

Whichever brand and engine philosophy fits your operation, the fastest way to find out what financing looks like is to run the numbers on your actual deal. Visit our homepage to see how BFC works with contractors nationwide, start a free, no-obligation equipment financing application to see what you qualify for, browse our equipment for sale and financing marketplace if you're still shopping for the right machine, or subscribe to the BFC blog for more equipment-comparison breakdowns like this one.