re: New 2023 Toyota Sequoia

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Turbocharging technology can be reliable when mated to engines designed for it since square one (low compression diesels) but it’s basically an OEM power adder in these applications.

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That is inaccurate. This 3.4l (they call it s 3.5l) i-Force V-6 is a ground up new engine designed for boost. The whole "high compression" that doesn't play nice with boost is a sad old cliche.

From what I have read they built a smart turbo motor with a ton of attention to cooling both in the heads with a dual-layer water jackets and lots of attention to combustion chamber cooling. They did a lot of valve seat and valve engineering for reliability and they are also using a water-to-air intercooler. Also, note they are using direct injection which has excellent flame travel and runs at cooler cylinder temps.


These engines are complex with turbos, variable valve timing, and all the associated electronics but so are pretty much every engine built today save for a few old dinosaurs. There is zero reasons a 10:1 compression turbo engine can't be designed and built to last 300-400k with little internal issues. If you had to bet on a manufacturer doing it well Toyota is near the top of the pile. Toyota tends to advance at (in the car industry) a glacially slow pace and the reason is tested engineering and QC which results in a great reliability and dependability reputation.