Good stuff...cheap too(less than $1 @ wallyworld). I'd been using Gunk, but this stuff is about half the price and cleans just as well without the noxious odor. Since its a foaming cleaner, I seemed to use less of it to get the entire engine clean. After I was done with the engine, I had enough to clean up my rear diff. & axle. If you're an avid engine cleaner, like me, ST eng. cleaner is worth a look.