Rodney

No, 3 in 1 oil is to thin and makes a very poor after run oil. The least expensive is ATF (automatic tranmission fluid) or any air tool oil. Some people use Marvel Mystery oil which is better than nothing but not as good as Marvel Mystery Air Tool Oil or any other air tool oil. Also remember that just a drop or two is not sufficient. You must use enough to completely coat the bearing surfaces in the crankcase and the cylinder wall and wrist pin bearings, about a teaspoon full or more and you need to manually turn the engine over a few times with it in different attitudes to get the oil in all the proper places. On a two stroke, you can inject the oil thru the carb or exhaust port. Some people even take out the plug and squirt some in the cylinder head but I do not recommend that as, every time you take out the plug and replace it, you risk doing some damage to the threads that hold the plug in. On a 4 stroke, you must inject the oil into the crankcase thru the breather tube, again using at least a teaspoon full or more, and then turn the engine over by hand with it in different attitudes to get the oil distributed over all the bearings. A few drops down the carb will then lubricate the top end.