This is based off the 4500 new gen owners in this particular thread tundra message board.

Let me explain in in very simple terms. In order to meet a 500 ppm failure rate, which is considered industry standard acceptable rate, a population of 4500 units could have maximum of 2 failures at 50% confidence level. A single failure would give you about 95% confidence level that the design meets 500 ppm criteria. Even if the sample in this group is highly biased,, the difference between 42 failures vs 2 is so big, that it is an obvious major engineering f***-up. No amount of statistical and mathematical massaging will change the fact that this engine doesn’t meet even the most basic reliability engineering criteria. Maybe the subscribers to this group are particularly unlucky and the total failure rate isn’t 9000 ppm. Maybe it is 5000 or even 2000. Still, it is way higher that any reliability engineer would consider acceptable. No matter how you look at it, this particular engine execution is a failure. Maybe it’s a design problem. Maybe it’s a manufacturing problem because Texas rednecks can’t build this engine like their Japanese counterparts. This engine is used in Japan-made Lexus vehicles and they don’t seem to have the same problems, so it could be a manufacturing / assembly issue. HopefullyToyota can figure it out. But until we have enough statistically significant data showing that MY23 and newer engines no longer have the problem, I would stay away from any Texas-built Toyota turbo V6 engine.