Horizontally opposed engines are structurally prone to oil-film breakdown at the top of the cylinder liners because of gravity, making solid contact between piston skirts and cylinder liners more likely. Their overall engine length (crankshaft) is also very short and their crankshaft bearings are narrow, requiring a stronger oil film. ZERO SP Titanium Engine Oil addresses these weaknesses. Its strong oil-film retention at the pistons prevents combustion pressure leakage, increasing torque and power. It also protects the crankshaft bearings from oil-film breakdown. Crankshafts, camshafts and other shafts rotating about an axis are supported by a strong oil film, helping them rotate more consistently about their centers and delivering noticeable reductions in vibration and noise and improvements in response and feel. To enhance friction reduction further, a special process incorporates liquefied spherical titanium particles of 21 nm (nanometers) or less. This improves extreme-pressure and shear resistance; the round particles also create a bearing effect that dramatically improves response. This lubricant specifically for horizontally opposed engines additionally offers excellent wear resistance, resistance to heat-related seizure, performance retention and dry-start prevention.