My business is building Race and hi performance street engines, there are several issues here that contribute to this oil consumption the light viscosity oil is part of the problem but also the ring packages that are now commonly used in almost all new style gas burning engines are very low tension. This is done to cut frictional losses of(HP& torque)and decrease fuel consumption as the piston rings were the biggest cause of these losses. Also the engines venting system can also contribute to some of this oil consumption. So the gains in Hp/torque and better fuel economy are considered a good trade off for a small increase in oil consumption. Also these lower friction rings are narrower and lighter and deliver a better combustion seal which also increases power and economy even though the smaller oil ring can slightly increase oil consumption.
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