Recently traded into a Honda EU2000i generator. Seems to run good on high idle but surges some on eco mode. I'm going to take the carb off and clean it , change the oil , spark plug and check over everything while I have it tore down. Looks like it calls for 10w-30 so I will probably stick with that and a 20 hour oci since I won't be using it a ton. What are you guys running as far as oil and weight?