Using MaxMPG is super easy. Just add it to your diesel fuel every time you fill up your tank. It's suitable for all diesel engines, so you don't have to worry about compatibility. One 16 - oz bottle can treat up to 400 gallons of fuel. As for maintenance, there's not much you need to do. Just keep using it regularly to keep your engine in top shape. However, make sure to store it in a cool, dry place. Also, follow all safety precautions while handling any fuel additives. That's all you need to know to get the most out of MaxMPG and keep your diesel engine running great.