Oilers/Plant Tenders (HHC) Civil Service Exam 2026 – 400 Free Practice Questions to Pass the Exam

The favored reason for a direct pressure system of lubrication over a gravity system lies in its ability to allow for better oil distribution. Direct pressure systems actively pump oil under pressure to various engine parts, ensuring that all components receive a consistent and adequate supply of lubricant, which is particularly important in high-performance or high-load scenarios. This method reduces the likelihood of oil starvation, where certain areas may not receive sufficient lubrication, which can happen in gravity-based systems that rely on the oil’s weight to flow to parts.

Additionally, direct pressure systems can maintain a constant oil pressure regardless of the orientation of the equipment or engine, which is particularly beneficial in applications where the machinery may be operating at different angles. This reliability in oil distribution significantly enhances lubrication performance, reduces wear and tear, and promotes longer equipment life compared to gravity systems.