Greetings. Is anyone using diesel fuel additives for proactive maintenance reasons? Read a lot about them and there are people on both sides about them. Are they harmful at all? Which brand is best? I don’t really trust the gas station I get my fuel from and have noticed my engine has been a bit louder lately. Also noticed the MPG slipping a bit. I did recently throw 285s on it and expected a dip but not a 5 mpg dip. Anyways, just curious what you all think. Thanks.