I just pulled an old Mclane edger out of the bushes in the back yard and want to use it. Never used it before and I can't find where the oil goes. The edger is 20 or 30 years old and there was rust under the gas cap. I am hoping that I can change the spark plug, add oil and gas and start edging. Any suggestion comments or even smart @$$ comments welcomed. It is a 4 hp engine.