The article says that they changed the V6 design but that the problem in the engines build prior to the change are OK. I guess they changed the design because the prior design was OK and did not need to be changed. That just does not make sense to me.
I still think the Toyota V6 even after the change is not right. GM states that the standard is 10 to 15 degree change and they are still getting 60 degree delta temperatures. I guess Toyota has the market cornered on quality and doesn't give a hoot about "customers".