Keep good documentation of everything. If after the 30 days something goes wrong with it and can be linked to issues you are having now, you can get those taken care of too. For example if there is a oil pressure problem now, they stick a new pump on it and a month later it spins a rod bearing. Since you can link it to a problem that was in their 30 day warrenty period, they should make the neccesary repairs. I delt with this on a transmission on a used car. Took it in multiple times during the little warranty they gave me and they fixed various things. Two months later the transmission blows. In the end they put in a new tranny.