Official advice vs actual needs

The cycle indicated in the manufacturer's manual (e.g. 10000 kilometers/12 months)

4S stores often suggest shortening the cycle (profit driven)

Change intervals for different types of engine oil

Mineral oil: 5000 kilometers/6 months

Semi synthetic: 7500 kilometers/9 months

Total synthesis: 10000-15000 kilometers/12 months

Key factors affecting the cycle

Severe road conditions (sandstorms/congestion) → reduced by 30%

Frequent short distance cold start → Increased engine wear

Turbocharged/High Performance Vehicles → Recommended Full Synthesis+Shortened Cycle

How to determine whether to change the oil?

Oil test paper detection (diffusion ring method)

Electronic dipstick reminder (high-end models)

Increased engine noise/fuel consumption

The consequences of not changing the oil for a long time

Oil sludge blocking the oil passage → engine cylinder pulling

Acid value increases → corrodes metal parts