New coffee maker is making coffee worse

Question: I bought a new drip coffee pot, and now, using the same coffee, I have a weak, nasty tasting coffee with an oil slick.Answer: Tough to know all the possible reasons why your new coffee maker is making coffee worse without more details on your new maker. The easiest advice is that you should run a 'cleaning cycle' through your brewer of two parts water and one part vinegar. Following that, a couple plain water cycles to make sure the vinegar is rinsed out. Vinegar is a powerful cleaning agent, and might eliminate with the nasty taste. Because your coffee is also weak, that could be that the coffee maker is not strong enough to properly extract coffee solids out of the ground coffee and into the pot. You could check the wattage of your new coffee maker. Anything close to 1,000 watts is acceptable, more than that is a good brewer, less than that is not optimal. The oil slick problem might get solved with the vinegar wash, but could also be a defect with the machine. If the wattage is close to 1,000 watts and your vinegar cycle doesn't improve the coffee, I'd say your coffee maker is defective and should be returned.