There is no bad brand name oil out there in 2002. Buy wherever it is convenient. Remember, any manufacturer's oil is going to be tested and recommeneded for their equipment. For example both Echo or Stihl markets oil. Their commercial leaf blowers run at up to 12,000 rpm day in, day out and last literally for years. Ask any lawn service guy. Once the engine is run in, use a synthetic, only for the aethetics of it. These modern angines are going to die in a crash long before you wear them out.