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4 cycle engines do not run on mixed fuel. Run on straight fuel. They have a spot to put oil in just like a lawn mover, and should be changed regularly. @ stroke engines run on mixed fuel.
You do not have one. Like 4-cycle push mower engines, these are splash lubricated. They lack a full-flow/pressure oiling system. When the oil gets dirty, dump it out and refill to proper specifications. Do this every 20 hours on this trimmer and it will stay happy for a long time.
Yes, something special to know. If the new fuel line is going into the gas tank, be sure to cut a steep angle on the end of the line going into the gas tank. This will allow enough of the line to get into the tank where you will be able to grab it thru the gas fill opening with needle nose pliers and pull it thru.
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