In a two-stroke engine, carbon is a natural by-product of incomplete combustion. Fuel and oil quality vary leading to various degrees of carbon deposit build up on critical engine parts over time. If the carbon deposits are left on engine components and allowed to accumulate, it can lead to reduced horsepower, reduced fuel economy, increased emissions, and in the worst case the deposits can cause engine damage. A novel two-stroke engine oil was developed specifically to remove these deposits, restore the operating efficiency, and potentially lengthen the useful life of the two-stroke engine.In order to prove the restorative ability of this novel technology, dynamometer tests and field trials were conducted. In the dynamometer portion, the oil was tested in two of the standard TC-W3® certification tests for marine engine oils. The first was the OMC 40HP and the second was the OMC 70HP test. Both test engines had heavy deposits from previous testing which were significantly reduced by using this novel engine oil. Final proof of performance data was obtained by evaluating the new engine oil in field trials. In the field trials two types of engines were used. One trial used an early 1970s Mercury 40HP carbureted engine. The other trial used 2007 model direct fuel-injected Mercury 225HP OptiMax engine. As many boaters keep and maintain their engines for a long time, this represents the range of engines in the market today. These engines were previously used and had deposit buildup. Similar to the dynamometer testing, deposits were removed from these engines by using this novel engine oil.In summary, for two-stroke engines to operate well, carbon build-up and deposits must be minimized. The new oil developed is significant and important because it successfully reduces deposits, hence restoring the engines operating efficiency. This may lead to reduced emissions, enhanced fuel efficiency, and longer operating lifetimes.