Stihl MS 162 Instruction Manual - Page 31

13 Mixing Fuel and Refueling the Chain Saw 13 Mixing Fuel and Refueling the Chain Saw 13.1 Mixing Fuel Information on Fuel Your engine requires a mixture of high-quality gasoline and 2-cycle air cooled engine oil. This engine is certified to operate on mid-grade unlea‐ ded gasoline with a minimum octane rating of 89 and no more than 10 % ethanol and 2‑cycle oil for air cooled engines at a mix ratio of 50:1. If you mix the fuel yourself, STIHL recommends STIHL HP Ultra 2-Cycle Engine Oil. NOTICE ■ Fuel with an octane rating below 89 may increase engine temperatures. This, in turn, increases the risk of piston seizure and dam‐ age to the engine. The chemical composition of the fuel is also important. NOTICE ■ Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as well. This could cause running problems or damage the engine. For this reason STIHL recommends that you use only quality unleaded gasoline. Information on Ethanol Content WARNING ■ At correct idle speed, the saw chain should not move. To reduce the risk of personal injury from loss of control and/or contact with the running chain, ensure proper idle adjustment before using your chain saw, 22.2. Gasoline with an ethanol content of more than 10% can cause running problems and major damage in engines and should not be used. For further details, see www.STIHLusa.com/ethanol. The ethanol content in gasoline affects engine speed. It may be necessary to readjust the car‐ buretor if you use fuels with varying ethanol con‐ tent. The idle speed and maximum speed of the engine change if you switch to a fuel with a much higher or lower ethanol content. This problem can be avoided by always using an ethanol-free fuel or fuel with consistent ethanol levels. 0458-200-8621-A English STIHL MotoMix STIHL MotoMix is ethanol-free, has a high octane rating and ensures that you always use the right gasoline/oil mix ratio. STIHL MotoMix uses STIHL HP Ultra 2-Cycle Engine Oil suited for high performance engines. For further details, see www.STIHLusa.com/ ethanol. STIHL recommends using MotoMix in your chain saw. If not using MotoMix, use only STIHL High Performance 2-Cycle Engine Oil or equivalent high quality 2-cycle engine oils that are designed for use in air cooled 2-cycle engines. The use of non-seasonal gasoline blends may increase the potential for pressure to build in the fuel tank during operation. For example, using a winter blend during the summer will increase pressure in the fuel tank. Always use gasoline blends appropriate to the season, altitude and other environmental factors. Do not use BIA or TCW rated (2-cycle water cooled) mix oils or other mix oils that state they are for use in both water cooled and air cooled engines (e.g., outboard motors, snowmobiles, chain saws, mopeds, etc.). Mixing Fuel WARNING ■ Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapor. Anytime you are filling a container at the fuel pump, remove the container from your vehicle and place it on the ground before filling. To reduce the risk of sparks from static discharge and resulting fire and/or explosion, do not fill fuel containers that are sitting in or on a vehicle or trailer. WARNING ■ Shaking fuel can cause pressure to build in the fuel container. To reduce the risk of fire and severe personal injury or property dam‐ age from fuel spraying, allow the fuel container to sit for several minutes before opening. Open the container slowly to release any residual pressures. Never open the fuel con‐ tainer in the vicinity of any ignition source. Read and follow all warnings and instructions that accompany your fuel container. To properly mix fuel: 31