What type of oil and gasoline do you nee d to run Craftsman 6.5 lawn mower?

Generally the YTH2348 requires SAE 30 oil and it needs to have detergents in it. Some SAE 30s don't. It should say it on the oil container somewhere. Gas and be any octane but a minimum of 87. Unleaded only.

Generally all 4-cycle lawn mower engines are tuned to use regular unleaded gas ,(I personally use mid or high grade unleaded)....and for engine oil use strait 30 WT engine oil...... I often put a dash of fuel system cleaner in each gallon of lawn mower gas,it is not absolutely neccessary but seems to help moisture stay out of gas..(DO NOT USE HEET or other methenol based fuel additives for this can cause overheating or scoring of piston and cylinder...but rather use a petroleum based additive,this allows the small amounts of moisture in fuel to pass through the carbeurator without clogging filters or fuel system for smoother running)..also...if you put lawn mower up for winter it is always helpful to use a fuel stabilizer such as "STABIL" or other such products (follow directions for use) and be sure to change the crank case oil in the spring before using....this will give you much longer life from your lawn mower...
Keep air filter clean!!!..... Happy mowing!!!....so, the answer?...regular unleaded and 30wt engine oil...if you would like..they have special engine oil for 4-stroke engines at most hardware and walmarts n such...but is just expensive 30wt oil... Enjoy your day,Todd