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Being an fb rated oil, it probably lacks the detergents that fc and fd oils haveI see Stihl oil that carbons equipment up daily. The oil performs good if the equipment is ran WOT and tuned properly. Ive seen this too often in trimmers that people dont run wot using Stihl oil. Blowers and trimmers with small spark arrestor screen is horrible to almost completely plug running Stihl Ultra in combination with low rpm