OK, donkey excrement plus 150 gallons of gas.
The Scam Detector is where we look at automotive products that are actually for sale (and actually get sold, sometimes to our listeners and readers) and figure out if they're real, or scams. Our team of white-lab-coat-wearing researchers (well, the coats were white before lunch) pores over all the data, and tells you whether these products do what they claim, or whether they're landfill.
Tom and Ray Magliozzi
Click and Clack, the Tappet Brothers
P.S. In fairness to the few non-shysters out there: in a very few instances, these products are legit. Read on to find out which ones are honest.