Why do some electric-vehicle makers keep finding room to cut cost without stripping away the parts drivers notice? One answer, according to former Tesla president Jon McNeill, sits deep inside the hardware that buyers rarely see.
McNeill said Tesla studied Chinese EVs through teardown work and carried some of those lessons into its own high-volume products. The core takeaway was not styling, screens, or marketing. It was engineering discipline: standardize the hidden components, reuse them across models, and remove as much variation from the factory floor as possible.
“The Chinese engineers are really disciplined about reusing parts underneath the hood that the customer can’t see, and they save a lot of money that way,” McNeill said.
That idea sounds familiar because platform sharing has been common in the auto industry for years. What stood out to McNeill was how far some Chinese manufacturers push it. In his description of recent BYD teardown work, the repetition extended beyond the basic vehicle architecture to ancillary hardware that many automakers still redesign model by model. He pointed to the same windshield-wiper motor, heat pump, and conduit appearing repeatedly across the lineup, a level of uniformity he described as efficient because those parts do little to change the ownership experience.
Tesla followed a related path in its own range. The Model Y shared about three-quarters of its parts with the Model 3, a decision aimed at easing production ramp-up and lowering complexity. For manufacturers trying to scale, that matters as much as raw battery performance. Shared parts reduce supplier variation, simplify assembly training, shrink tooling demands, and make quality control easier to repeat at volume. In a business where margins are often thin and launches are expensive, those gains can compound quickly.
That is also why teardown analysis remains such a powerful industry tool.
Automakers are not just comparing features when they strip a rival vehicle to the last fastener. They are tracing every design choice back to manufacturing time, procurement load, and service complexity. Ford chief executive Jim Farley has said competitor teardowns were eye-opening, and one comparison found the Mustang Mach-E carried about a mile more wiring than a Tesla Model 3. For engineering teams, discoveries like that are less about copying a rival than identifying where complexity has accumulated unnoticed.
In China, those lessons are being reinforced by the pace of EV industrialization. A teardown exhibition in Gifu, Japan, displayed more than 90,000 parts from over a dozen EVs, giving suppliers a close look at how Chinese brands and Tesla reduce part counts and standardize systems. That pressure is arriving alongside rapid advances in battery integration. BYD’s latest battery push includes a Cell-to-Body architecture that turns the pack into a structural element, cutting component weight while improving stiffness and space efficiency.
McNeill framed the stakes in broader terms. “There’s a reason only one auto company has been started and scaled in the last hundred years, and it’s because it’s really hard. It’s really, really hard and it’s really capital-intensive,” he said.
That helps explain why hidden parts now matter so much. In the current EV market, competitive advantage is increasingly built not only on batteries and software, but on the quiet repetition of components no customer plans to admire.