Engine oil becomes dirty or weak over time. Here are the clear signs your oil needs changing.
1. Engine Becoming Louder
Tapping or ticking noise = oil too thin or dirty.
2. Exhaust Smoke
Blue smoke = oil burning
Black smoke = mixture too rich
3. Oil Color Is Too Dark
Dark is normal, but:
- Thick sludge
- Strong burnt smell
→ means oil is expired.
4. Engine Feels Weak
Old oil increases friction and reduces power.
5. Dashboard Oil Light
This is dangerous.
Stop driving and check oil immediately.
Conclusion
If you see 2–3 symptoms, change the oil as soon as possible.