I am often asked, ‘is 2 cycle oil interchangeable with 4 cycle oil?’ The answer is a resounding NO! Two cycle and 4 cycle oils have different formulas for use in two distinctly different ways.
If you were to put 4 cycle oil in a 2 cycle engine deposits will build up. Deposits can gunk up and severely curtail the life of a two cycle engine. Likewise, 2 cycle oil is too thin to provide effective lubrication to 4 cycle engines.