two wheels forever > how-tos > How to do a Complete Softail EVO Oil Change and Flush

How to do a Complete Softail EVO Oil Change and Flush

This how-to is applicable to 1984 to 1999 Harley Davidson Softails, although it may be helpful for other HD Models, especially with Evolution motors. These pictures and steps are from a 1993 FXSTS.
Softail Oil Change - Step 1  
Step 1:
Warm up your motorcycle to normal operating temperature. This will help the oil drain easier, and also make sure any contaminants are suspended in the oil. Locate the oil tank drain hose, which is clamped to the frame to the left of the transmission, below the starter.
Softail Oil Change - Step 2  
Step 2:
Loosen the hose clamp with a screwdriver or a 1/4" socket, and remove the hose plug.
Softail Oil Change - Step 3  
Step 3:
Drain the oil. Once the oil tank has completely drained, replace the hose plug and tighten the hose clamp.
Softail Oil Change - Step 4  
Step 4:
Locate the oil filter at the front of the engine. You should be able to twist it loose (counterclockwise) with just your hands, but if the person that installed it overtightened it, you may need a filter wrench.
Softail Oil Change - Step 5  
Step 5:
Wipe the oil filter mounting surface clean with a rag.
Softail Oil Change - Step 6  
Step 6:
Dump a little fresh oil into the new oil filter, and be sure to lubricate the filter gasket with some of the oil. Reinstall the oil filter, twisting it clockwise until the gasket just touches the oil filter mount, and then tighten another 1/2 to 3/4 turn. Do not overtighten.
Softail Oil Change - Step 7  
Step 7:
Add 2-1/2 to 3 quarts of fresh oil to the oil tank, and reinstall the filler cap. Most people stop at this step, and don't flush all of the dirty oil out of their crankcase. It's a little extra effort, but it's worth it.
Softail Oil Change - Step 8  
Step 8:
Locate the oil pump return line. This should be the right-most hose (the one closest to you when looking at the oil tank from the right side). Loosen the hose clamp. If you've never had this oil line disconnected from the oil tank, you may still have the stock hose clamp. You'll have to destroy this clamp to remove it, but you can easily replace it with a standard screw-type hose clamp.
Softail Oil Change - Step 9  
Step 9:
Once this oil line is disconnected from the oil tank, insert one end of a piece of clear plastic hose into the end of the oil line. Insert the other end into your oil pan (or an empty quart of oil).
Softail Oil Change - Step 10  
Step 9:
Start your motorcycle, and open the throttle a little bit to get the oil pumping. You should see dirty oil begin to flow through the clear hose. Let your bike run for about 30 seconds, and then hit the kill switch and add more oil to your oil tank. You may have to repeat this process several times until you see fresh oil start to flow through the clear hose. The advantage of draining the dirty oil into an empty quart container is that you'll be able to measure exactly how much to replace.
Step 10:
Remove the clear hose from the oil pump return line, and reconnect to the oil tank. Reinstall and tighten the hose clamp.
Step 11:
Start your motorcycle and check for leaks at the oil tank drain hose plug, the oil filter gasket, and the oil pump return line. That's it!
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