Final answer:
The statement that synthetic oils never break down is false; synthetic oils can degrade over time due to high temperatures and mechanical stresses, and get contaminated, which leads to the loss of their effectiveness.
Step-by-step explanation:
The statement that synthetic oils never break down is false. While synthetic oils are engineered to have a longer lifespan and better chemical stability compared to conventional oils, they can still degrade over time due to the high temperatures and mechanical stresses they encounter inside an engine. Although synthetic oils do not break down as quickly as conventional oils, they will eventually degrade and lose their effectiveness, requiring replacement. It's also important to note that contamination from dirt, metal particles, and byproducts of combustion contribute to the degradation of oil's quality, necessitating its change after a certain period or mileage.