Not only is it nothing to be concerned about, in many ways it is actually a good thing, especially when a long drain interval is the goal. While excessive consumption is obviously bad and hard on the wallet, the addition of the quart helps to replenish and stabilize the additive package. Especially the TBN (Total Base Number) which helps in neutralizing acids. In addition the boost to dispersancy capability(ability to keep contaminants in suspension -particularly soot) is always helpful.