... backpack brush cutter 1, two stroke engine fuel (# 90 above), oil, sae30. Xinji idle break-in 2 hours, the heat engine ... 30 hours or so replacement of a motor oil. Before and after each use check the oil oil level.2, the two stroke engine ... fast and should be in low speed state stop.4, oil, want to use correct types, are factory product, clean, gasoline ...