An engine parts supplier called Federal-Mogul Corporation has managed to adapt a specialized two-piece oil ring design from diesel engines into a gasoline engine form. The patented oil ring tech, known as an LKZ ring, not only can reduce oil consumption by 50 percent, but also reduces frictional losses by 15 percent (compared to standard conventional oil ring designs).

Where as traditional rings apply equal pressure on the downstroke and upstroke, the new ring design primarily provides pressure on the downstroke. The surface inside the piston bore also employs a unique design, offering a tapered, two-step surface (versus an untapered surface in standard oil rings).

The result is that oil is more effectively returned to the oil pan, reducing the amount of oil that enters the combustion chamber. The less oil entering the combustion chamber, the better, as this has numerous undesirable effects, such as wasting oil via combustion and coating the spark plugs with carbon byproducts, reducing their ability to combust gasoline. The improved oil performance also leads to better cylinder lubrication and less friction.

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Source: DailyTech - New Piston Ring Could Drastically Improve Gas Engine Efficiency, Longevity