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Hey the GX390 engine oil capacity is just a little over 1 quart of oil you have to place the engine on a flat surface to verify that the oil is at the correct level, if your engine has a big dipstick it has to be filled to the lip where you pour in the oil or if it has a small and long dipstick check for 2 dots and fill to the upper dot.
OK, here's a YouTube video describing how to do this. However it's not in English. But the guy does a good job of showing how to find to drain port and should be sufficient for you to figure the rest out.
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Several tips; Maintain the air pressure in tires at the highest max PSI as embossed in the sidewall of each tire. Don't rev the engine needlessly. Turn the engine off when stuck in traffic. Change to a larger front sprocket with one or two more teeth, ( 12 teeth to 13 or 14 teeth ). Ride slower for less wind resistance. Keep the chain oiled. Change gearbox oil every 2000 miles. Please note that you may need to add a link to the chain in order to use the larger sprocket. Please rate my answer. Thanks.
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