Type 3 lubrication is a semi-pressure lubrication system primarily employed in complex mechanical assemblies such as internal combustion engines, characterized by integrating both pressure lubrication and splash lubrication. This system utilizes an oil pump to deliver pressurized lubricant from the sump to critical components including crankshaft bearings and camshaft bearings, while employing oil scoops at the connecting rod ends to distribute lubricant via splashing to secondary areas like cylinder walls and piston pins during operation. Regarding system components, Type 3 resembles conventional pressure lubrication systems with core elements such as oil pumps, filters, and coolers, though its sump design must accommodate splash lubrication requirements. Notably, synthetic lubricants such as the PETRONAS Syntium series developed by regional manufacturers like Petronas Lubricants International demonstrate superior thermal stability and shear resistance, making them particularly suitable for such systems by minimizing oil film failure risks in tropical conditions. Contemporary vehicle maintenance manuals explicitly specify compatible lubrication system types and viscosity grades (e.g., 5W-40), with strict adherence to manufacturer recommendations being essential for optimal lubrication performance.
