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Using the correct oil in your car is very important. The bearings in your engine are designed with very tight clearances that require a specific weight of oil running through them.

The numbers on your oil indicates the oil's thickness. For example, SAE 30 weight oil is heavier than SAE 20 weight oil. So you are probably asking, "what is the 'W' all about?" The W indicates a multiweight oil, where the "W" indicates WINTER use. SAE 30 weight oil acts like a 30 weight oil at all temperatures. So when it gets really cold that 30 weight oil gets really thick. It will no longer flow through the tiny clearances your engine requires. An oil rated 10w30 will behave differently when it is cold. When the temperature of 10w30 drops it acts like a 10 weight oil. That way it will still be fluid enough to flow where it needs to flow. Once the engine(and oil) warms up to temp then it will act like a 30 weight oil.

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Q: What is the difference between SAE 30 oil and 10w30 oil?
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