High rates of oil consumption reduce the total volume of oil protecting an engine, impede oil's ability to lubricate, reduce fuel economy, increase exhaust emissions and make frequent oil changes necessary. To ensure proper engine protection, oils with low shear stability need frequent replacement. Conventional oils often allow engine heat to climb excessively during stressful operations, which promotes oil breakdown and engine wear. Their low coefficients of friction ensure the maximum delivery of engine power with minimal frictional losses. Rust inhibition is an especially important feature for engines subject to frequent short-trip operations or for stored engines.
Acid neutralization protects engines from damage caused by corrosive by-products of combustion.
Loss of additive performance limits the durability of conventional motor oils. When conventional oils are left in place too long, they may expose engines to increased rates of wear, corrosion, deposit accumulation and sludge buildup. All makers of domestic and foreign nameplate vehicles sold in North America recommend the use of specific viscosity grades of API certified oils.