Oilers/Plant Tenders (HHC) Civil Service Practice Exam 2025 – The All-in-One Guide to Exam Success!

High-viscosity lubricants are indeed intended for applications that involve low-speed machinery. The reasoning behind this is that high-viscosity lubricants provide a thick protective film that is effective in minimizing wear and tear in situations where there is less movement. They aid in maintaining a stable lubricant layer, which is necessary when machinery operates slowly and requires greater lubrication thickness to compensate for the lower pump rates and the possibility of increased friction and heat generation.

In contrast, low-viscosity lubricants are typically utilized in high-speed machinery where the lubricant must flow rapidly to ensure adequate coverage and cooling, thereby preventing overheating and maintaining efficiency. Therefore, the assertion that high-viscosity lubricants are designed for low-speed machinery holds true.