If you want a Tahoe that'll outlive your mortgage, hunt down a 2000-2006 GMT800, the last generation before GM added Active Fuel Management and turned oil consumption into a lifestyle. Those trucks routinely hit 250k miles with just a transmission rebuild somewhere past 150k. Everything from 2007 forward carries the AFM lifter time bomb: one collapsed lifter means a $5,000 engine teardown, and the 6L80/8L90 transmissions fail even when you do everything right. The 2021 redesign rides better and looks sharper, but dealership techs report transmission replacements at 1,400 miles, and GM's killing CarPlay in 2026, locking you into their buggy infotainment forever. Buy a GMT800 if you want peace of mind, or budget for an AFM delete the day you sign. Skip this if you want a full-size SUV that doesn't require a maintenance prayer circle.
The GX460 was Lexus's bulletproof V8 swan song, silky, plush, and routinely hitting 200k miles with minimal drama. The 2024 redesign swapped that proven engine for a twin-turbo V6 that tows hard but drinks just as much fuel, then wrapped it in a cheaper interior that owners call 'un-Lexus-like' and plagued the first year with brake squeal (8+ month backorder on parts), hood flutter, and falling headliners. If you need genuine off-road capability or 9,000-lb towing, the GX550 delivers; if you want the on-road luxury the badge promises at this price, a lightly used GX460 or a German unibody will leave you happier.