At first glance, the 2021 Lexus IS certainly looks brand new. The styling is cleaner, the proportions are better, and when you start perusing the options list, there’s way more on offer than there was previously. But a lot of carmakers like to pull this trick of promising an “all-new” vehicle when said vehicle, well, isn’t new at all. That’s the case with the latest Lexus IS.

The stuff that actually matters (at least, to us) — chassis, engine, transmission, drivetrain, etc. — much of it carries over unchanged from the outgoing IS.
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https://www.motor1.com/reviews/448992/2021-lexus-is-first-drive/