I have only been maintaining cars and lawn equipment for about 15 years or so, but I do not recall a time when quality oil was less than $4 a quart. But again, I am one of those odd people that only used OEM oil for my cars and equipment. I don't mind using Dexos 1 in the car or Genuine Honda or Briggs oil in my lawn equipment. The Ducati dealer would use Redline in my GT1000 which was upwards of $10 a quart. By no means was this necessary, but never having an issues and only smooth running engines, I continue on this path...