Given the task definition and input, reply with output. In this task, You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.

Mixed one bottle of this in when I changed my oil 2 weeks ago, 2 days later my truck started running rougher then before, after a few more days pass and it won't start when hot. Really sucks because all that was wrong before was a sticky injector when cold now I can't start my truck until it cools back down.
negative