Mike - Thanks for answering my earlier question regarding warranty. Another question on the CAN tool. I understand that with this tool you can not selectively delete certain codes, it is all or nothing. If this is the case and I clear all the codes when I do this am I clearing any good codes that I need? Is the automatic maintenance reminder tied to these codes? If I delete all the codes will it wipe away where I am with my oil life from a dealer maintenance perspective? I don't know....can you please comment.