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This White Diamond Eldorado ETC represents the final generation of Cadillac's personal luxury coupe—the last hurrah before SUVs ate everything. Under the hood sits the Northstar V8, Cadillac's answer to "we can engineer coolant passages that won't catastrophically fail," paired with the 4T80-E transmission. Low mileage and single-owner history suggest this one dodged the mechanical lottery that claimed so many of its siblings.

Buick's Nailhead V8 earned its name from a specific technical detail, not marketing fluff or folk wisdom. Understanding the naming reveals how mid-century Buick engineers thought about valve train design—and why the engine became a staple in hot rods and custom builds for decades.

GM's new plug-in hybrid arrives with the styling conviction of a corporate committee meeting—competent driver tech and a powertrain that works, but hobbled by the fact that it's China-market only. Another reminder that Buick's actual identity died somewhere around 2010.

The Roadmaster Estate represents a specific moment when American luxury wagons still meant something—this first-owner example came loaded with factory options that most wagon buyers skipped. With the LT1 V8 and full Prestige Package, it's a seven-seater that didn't sacrifice comfort for practicality. Clean examples are getting harder to find, and values on well-optioned specimens are finally climbing.