Manuals → Brands → Kohler Manuals → Automobile Parts → Courage XT-6 → Owner's manual Kohler Courage XT-6 Owner's Manual [Page 5]: Oil Recommendations Kohler vertical crankshaft owner's manual. Table of contents Download Manual (19 pages, 0.38 Mb) Share this page Add to your account Write a comment Ask a question 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Page 5 of 19 Primer Bulb (If Equipped) Engine ID Label (Example) Fuel Valve Figure 1. Courage XT-7, Vertical Shaft Engine. Oil Recommendations Using the proper type and weight of oil in the engine is extremely important, as is daily checking of oil level and changing oil regularly. Failure to use the correct oil, or using dirty oil, will cause premature engine wear and failure. Refer to Oil Check/Change maintenance instructions. Oil Type Use high-quality oil that ranks at or above the American Petroleum Institute's (API) SJ service class. Select the oil's viscosity based on air temperature at REC OM MEND ED SAE VISC OSI TY GRA D E S 10W-30 °F -20 0 20 32 °C -30 -20 -10 0 TEMPERATURE RANGE EXPECTED BEFORE NEXT OIL CHANGE Figure 2. Viscosity Grades Table. Use service class SJ rated oil or higher. Do not extend the oil change intervals longer than recommended as this can cause engine damage, and may void the warranty. An API symbol on the oil container See Figure 3. 10W-30 Figure 3. Oil Container Logos. Fuel Cap Air Cleaner 10W-30, SAE 30 40 60 80 100 10 20 30 40 SAE 30 Engine ID Label (Example) Fuel Tank Fuel Recommendations WARNING: Explosive Fuel! if ignited. Store gasoline only in approved containers, in well ventilated, unoccupied buildings, away from sparks or running since spilled fuel could ignite if it comes in contact with hot parts or sparks from ignition. Do not start the agent. General Fuel Recommendations Purchase gasoline in small quantities and store in clean, approved containers. Use a container with a capacity of two gallons or less with a pouring spout is recommended, as it is easier to handle and helps eliminate spillage during refueling. To minimize gum from previous season. Do not add oil to the gasoline. expand. Fuel Type For best results use only clean, fresh, unleaded countries using the Research method, it should be 90 octane minimum. Unleaded gasoline is recommended as it leaves less combustion chamber deposits. Leaded gasoline may be used in areas where unleaded is not available and exhaust emissions are not regulated. Be aware that the cylinder head may require more frequent service. Gasoline/Alcohol Blends Gasohol (up to 10% ethyl alcohol, 90% unleaded gasoline by volume) is approved as a fuel for Kohler use of these fuels will not be warranted. 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Jun 24, 2013 03:53: I would be happy to check spark plug on my Courage XT-7 but I can't find the darned thing. The manual does not tell how to access the spark plug nor does it tell where it is located. Sounds simple to me and I feel foolish for asking this question but I have looked all over this engine and I just can't find the plug. Can someone help me?