Hi there,

when a went to the dealer for an oil change the dealer told me to replace a MAIN BEARING BOLT; is there any body can tell me what it is and how did they know it has a problem (my car runs smooth) unless they check the crank shaft?

Thanks,

 

ask them, how did they come up with the conclusion...

since we are not them, we cannot tell you why or how they came up with the conclusion

 

Welcome to AZ! I moved your thread to the 1/2G MDX section, where you will get more specific advice.