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Originally Posted by Jetboy
I haven't found this to be accurate. At all. The 150's all share the same parts made at the same factory on the same line. The only differences are interiors. In our case engines and transmissions are different between GX and T4R. The idea that a GX is more heavily built is complete nonsense. Frames and such are identical. Most parts like blower motors, control arms, etc. are the same part numbers.
Otherwise I have no evidence or indication that Lexus vehicles are more reliable. Or higher quality. The parts that have failed on my RX350 are rear shocks (both sides - Lexus specific) the infotainment/navigation unit (lexus specific), and a rear wheel bearing (shared with Highlander). On my IS250 it had carbon buildup issues that resulted in engine rebuilds. That engine never carried over to toyota because of this. Similarly the valve springs that failed on the 2GR in the IS350 were fixed before carrying over to the Tacoma. Generally I would anticipate higher quality materials on the interior AND higher rates of mechanical failure with Lexus.
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Just look at the curb weights on both vehicles. It's almost half a ton. Granted the V8 definitely adds some weight over the V6, but even subtracting from that I have a hard time believing that there's a 500lb+ delta in just interior components. There's only so many options you can tick, and things like heated seats and levinson speakers only weigh so much over the Toyota counterparts.
Quality wise, both are quality products. But the 4Runner is built more cheaply, plain and simple, because they are building to a cheaper price. Even though most of their products share platforms that frequently run off the same assembly lines, Toyota places tighter tolerances on the Lexus products. And the Prado sold under the Toyota name is sold as a premium sport utility vehicle over cheaper alternatives like the FJ, Fortuner, and LC70.
I agree though, I don't see why Lexus product would be significantly more reliable. Like you mention, fancier electronics and new direct injection systems are more problematic, if anything. But in the case of the GX, it's got the V8 straight from the Tundra and Sequoia, and a nav system that's about a decade old
so those aren't a concern.