Originally Posted by nova 42qd
The CR results are from owner surveys - thousands of them. Probably not perfect but as noted a good starting point.
I have 2007 with a 5.7 liter. Isn't it the same engine but larger displacement as the 4.7? The 4.7 was the base engine in 2007.
Know a few people with 5.7 engines in Tundras and Sequoias, which is the same vehicle but an SUV. Never heard a problem with reliability. Likewise my mechanic says its a great truck...on the rare occasion it needs to be worked on.
The 4.7 is from the UZ family, while the 4.6 and 5.7 are from the updated UR family. Completely different including block.
The 5.7 UR has had way more issues, and early failure than the previous, including cracked blocks, and piston failures. Camshaft tower leaks are very common on these, with some having the issue before 10k miles. But yet they are still using the same sealant. This leak is hard to find, and many donít know because it starts out very slow.
Yes, they can be reliable, but not always.