When Should Engine Oil Be Changed Based on Color?
4 Answers
Engine oil must be replaced when it turns deep black. Below are specific methods for selecting engine oil for your car: 1. Performance selection: If you prioritize the long-term effectiveness of the oil, you can choose Mobil oil; if you focus on the oil's cleaning ability for the engine, you can use Shell lubricants; if you need lubricants with strong oil film toughness, it is recommended to use Castrol. 2. Driving conditions: If you frequently drive in congested areas, have an older vehicle, or operate heavy-duty vehicles for long-distance transportation, the viscosity of the lubricant can be appropriately increased. 3. Engine type: For naturally aspirated engines, you can choose mineral oil or semi-synthetic oil. Compared to naturally aspirated engines, turbocharged engines have a more compact structure and operate under harsher conditions, requiring higher-quality lubricants with better fluidity, preferably full synthetic oil.
I've always taken care of my car myself, and checking the oil color is something you need to know. Newly added oil is a light golden color, clear and transparent. Over time, it gradually darkens, first turning brown, and eventually may become as black as ink. Once it turns black, it means there are too many impurities and it's time for a change. I pull out the dipstick to check the oil myself. If I notice the color has darkened along with increased viscosity or the presence of metal particles, it's time to change it immediately. If not changed, the engine internals may wear out faster, leading to increased noise or difficulty starting. I check it regularly every 5000 kilometers to ensure safety.
When I first learned to drive, I was completely clueless about engine oil color. Later I learned that fresh oil is translucent with a slight yellow tint, and gradually darkens after some driving. Once during an oil change, I noticed it had turned as black as coffee stains, and my friend said it was too dirty and advised changing it immediately to prevent engine issues. Now I've developed the habit of regularly checking with the dipstick - when the color turns deep black, I schedule maintenance, and the car runs smoother and lasts longer.
As a daily commuter, I pay special attention to oil changes to ensure safe journeys. The transition of engine oil color from light to deep black is a crucial indicator, showing it's nearing saturation from absorbing contaminants. Once the oil turns pitch black, it must be changed immediately—otherwise, engine overheating or failure on highways poses serious risks. I also monitor oil levels alongside this; these simple maintenance steps can extend my car's lifespan and provide peace of mind.
