No, oil additives aren’t bad for your engine. Depending on the product that you choose, of course! In fact, the vast majority of oil additives will actually do your engine the world of good. They can help to reduce the wear and tear on your engine, ensuring that it lasts you for even longer. If you choose the right oil additive for your engine, it can help to improve your fuel economy, reduce the likelihood of corrosion and rust, as well as prevent any other serious types of damage to your engine.