Which engine servicing operation generally requires pre-oiling prior to starting the engine?

Pre-oiling is a critical step associated with the engine installation process. This practice involves supplying oil to various engine components before starting the engine for the first time following installation. The purpose of pre-oiling is to ensure that all moving parts receive adequate lubrication as soon as the engine starts, which helps to alleviate potential wear and tear. It can be particularly important after an engine has been completely assembled and has not been run, as it helps to prevent metal-on-metal contact that could occur if the engine starts without oil circulation.

In contrast, routine maintenance typically focuses on activities like checking fluid levels or changing filters, which do not necessarily require a specific pre-oiling step. Engine disassembly involves taking the engine apart, and while oil may need to be managed during this process, it does not require pre-oiling since the engine is not being started afterward. A fuel system check primarily assesses the fuel delivery components and does not involve operations that necessitate pre-oiling.