1. No such thing as the best oil. I have used and reccomend Penziol outdoor at a ratio of 40:1. 30:1 will work but really is more oil then needed. Stay away from the synthetics until the engine has some use on it. Synthetics my prevent the rings from seating properly on a new engine. Synthetics are also thinner and do not lubricate the metering needle in the carb well and can cause pemature wear. The flexable flapper valves and diaphram aslo do well with Penzoil and tend to get dry and brittle with synthetics. Just my experiences running gas engines for the past 15 years.

2. Any battery type will work as long as output voltage is 4.8 to 6 volt. Use no less then 1000 mah. Lithium batteries will require a regulator. You get no more power from running higher voltage. I set all my regulators to 5.5 volts.

3. We covered this, stay away from synthetics.......................NO advantage! I'm sure I will get comments on this but call around to lawn services and ask how many guys that use their gas lawn powered 6 days a week for hours on end use synthetics. The answer is none of them do and their equipment sees hundreds of hours of use each year.