Why change oil every 7-10 thousand km?

The Truth About Oil Change Intervals

Many car manufacturers recommend changing engine oil every 15–30 thousand kilometers. But why do experienced mechanics advise doing it much more often?

What Happens to Oil During Engine Operation

Oxidation and Aging

Engine oil begins to degrade from the very first day of use. High engine temperatures (up to 300°C near piston rings) accelerate oxidation.

Contamination Build-Up

Fuel combustion byproducts
Metal particles from component wear
Moisture from condensation
Soot and carbon deposits

Real-World Driving Conditions

Frequent short trips (engine does not reach operating temperature)
City traffic (idling in traffic jams)
Variable fuel quality
Dust and sand on roads
Sudden temperature changes

Why Is It Important?

What Happens to Engine Components Without Timely Oil Changes:

Component	Consequences
Piston rings	Carbon buildup → compression loss → increased oil consumption
Crankshaft bearings	Abrasive wear → engine knocking → major overhaul
Camshaft	Scoring on lobes → unstable valve operation
Turbocharger	Blocked oil passages → bearing overheating → turbo seizure
Hydraulic lifters	Deposits → valve ticking → incorrect clearances

Repair Costs If Ignored

Piston ring replacement: 6000–10000 PLN
Bearing replacement: 2000–5000 PLN
Engine overhaul: 10000–20000 PLN
Turbo replacement: 800–2000 PLN

Compare: an oil change costs 350–500 PLN. Saving on oil = repair costs 20–50 times higher.

Twin Torque Service Recommendation

Optimal interval: every 7–10k km or once per year

“An oil change is the cheapest insurance against expensive engine repairs.”

Tips

Use oil with the recommended viscosity
Replace the oil filter at every oil change
Check oil level weekly