2010 Consumer Reports Owner Survey says Z is 45% below average in reliability

SeattleLion

Consumer Reports has published the results of its 2010 owner survey. The 370 has lost reliability points. It is now shown as solid black (much worse than average). The survey shows results for the 2009 Z. The 2010 hasn't been around long enough for them to rate it.

Engine Minor and Engine Cooling rated worse than average
Paint/trim, squeats and rattles, and body hardware all were rated (by owners) much worse than average.

Everything else, except for audio were rated much better than average.

None of this is a surprise to readers here. The ratings pretty well mirror how people here have discussed their cars. What is concerning to me is the worse than average rating on engine cooling. According to Nissan and backed up by forum members is that for normal driving the oil temps stay below excessive heating. The readers of Consumers Reports are not likely to be tracking their cars. That means a significant number of poeple who use their Z's on public roads are experiencing oil temperature problems. I am assuming it is oil temp, since I haven't seen any reports of water temp getting too high.

They rated the 370 as expected to be 45% below average reliability. The Infiniti G coupe, on the other hand, had much better than average reliability for engine cooling. With an overall reliability rating of average.
The overall rating suggests that G owners will have cars that are 42% above average in reliability. I don't understand how the same engine-transmission combination (7 speet AT) gets such vastly different owner ratings.