How to Tell When Engine Oil Needs Replacement

[DeStephen]

Methods to determine when engine oil needs replacement: 1. Observe with oil test paper: Extract a small amount of oil and drip it onto the test paper. Let it sit overnight until the oil fully diffuses on the paper. The more distinct the boundaries between the diffusion ring, precipitation ring, and diffusion ring, the more severely the oil's performance has degraded. 2. Judge by driving feel: Engine oil has a performance shelf life. When you notice sluggish acceleration or reduced power during a certain period, it indicates the oil has reached its expiration and requires replacement. Engine oil, also known as motor lubricant, serves multiple functions including lubrication and wear reduction, auxiliary cooling, sealing against leaks, rust and corrosion prevention, as well as shock absorption.