Synthetic oil versus conventional mineral oil
Synthetic oil
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Many newer cars
require synthetic oil, as it offers better protection for the engine.
The advantage of synthetic oil is that it can withstand higher
temperature and can work longer without losing its lubricating
qualities. Synthetic oil doesn't get thicker at below-zero
temperatures and provides better engine lubrication at a cold start.
Using synthetic oil makes perfect sense if you have a low-mileage or
turbo engine or often drive under severe conditions such as high
temperatures, excessive load or long intervals without an oil change.
However, using synthetic oil in
high-mileage engines is not always worth the extra cost. Since
synthetic oil is "thinner," a high-mileage engine filled with synthetic
oil is more likely to develop leaks or run noisier.