engine replacement in rx8
 

after taking in my rx8 because the check engine light was on, the dealer calls me and says that mazda wants to replace my engine. the car is still under warranty. in november i took it in because it was leaking oil. the tech said that the metering pump was what was leaking so they replaced it.

so now they want to replace the motor because this pump was changed. the car only has 33k miles on it. i called another dealer and they said that they already replaced 10 cars motors. mazda supposedly has been having trouble with them so now as preventative measures is replacing motors.
they didnt change it yet so should i let them do it? has anybody else gone through this already? any help is greatly appreciated