You probably will not be able to diagnose a bent connecting rod until significant damage has occurred to the block. The predominant indicator of a problem is excessive oil consumption.

So, can you get the dealership to warrant the level of oil consumption for the first 5K miles? Probably tell you to stuff it, but, if you state your concerns and you can get them to agree that it should burn less than 2.5 quarts of oil in 5K miles then you would be all set.

Unfortunately, I'm quite sure that they will believe that 1 quart per thousand is fine. This could already be well on its way into the "problem".

Without such a guarantee, you are rolling the dice to the tune of 6K.