The easiest way to know is to check your owner’s manual and keep an eye on your mileage, but there are other signs too. If the oil looks very dark, the engine sounds louder than usual, or your oil warning light comes on, it’s probably time for a change. Driving habits and weather can also affect how often you need service. Around oil change Calgary discussions, many drivers mention that frequent short trips and stop-and-go traffic can make oil wear out faster than expected.