Transmission fluid flush promotion for $88.88. They put in fluid but said it worked on all cars. NOT A TRUE STATEMENT. GM Dextron fluid is different than Ford's Mercom. They reluctantly put in an enhancer converting any fluid to Mercom V. Only one tech knew that an additive existed. I called all the techs together. Charged me $16.99 for additive which obviously should not have been charged since MERCOM V is the requried fluid.