Engine oil is the lifeblood of your vehicle, and it's important to change it on schedule. However, can you just top it off?

When one kind of fluid mixes with another, it reduces the effectiveness of one or both of them, depending on how the contamination happened, and can cause all kinds of havoc in an engine.

Oil pressure is, typically, a good thing and keeps everything inside the engine slippery and running smoothly. Too much oil pressure, which can be caused by pouring too much oil into an engine ...