The quick chain adjuster, which utilizes a toolless design to make adjustments even quicker and easier, is an optional add-on. The carburetor preheat shutter of the MS 250 allows you to get the chainsaw going beforehand, so that it is ready to go when you are. The fuel and oil caps of the MS 250 require no tools to be opened, and have retainers that keep them from getting lost. For the MS 250, Stihl recommends using the RMC3 68 Oil-O-Matic saw chain, and an 18" guide bar.