My main bearing, went out at 51k, same deal. i took it into the delarship where i had puchased it two months earlyer. by the time i got her to the stealership, there was another louder knock. they tore her apart, and told me the second knock was a valvetrain problem, due to no oil. (i checked it the day before.) they put it back together, and tried to charge me $1000, until that is, they found the initial problem. The main bearing, so my engine replacement was free. Thank Jebus I signed the extended warenty.
