The STIHL Service Kit 13 for gas chainsaws can be used to carry out simple maintenance work on your chainsaw yourself. Proactive, regular standard maintenance measures such as replacing the air filter, fuel filter and spark plug, help increase the service life of your chainsaw. This will enable you to protect machine components and parts from dirt and damage and ensure that your chainsaw’s engine always operates reliably and delivers optimum performance. Suitable for MS 271, MS 291, MS 311 and MS 391 models. The STIHL Service Kit 13 includes the following components for standard maintenance tasks: Fleece air filter, Spark plug and Fuel filter.