Trimmers are designed to use nylon cutting line to cut through long grasses and weeds, where as brush cutters use a heavy duty cutting blade for more substantial cutting e.g. bramble bushes.

The oil/petrol ratios differ from machine to machine. Always refer to the engine manual. If you have a 2-stroke engine our fuel mixing bottle, measures the exact amounts needed, but it is important to remember to only mix enough fuel needed per cut.