The "W" stands for Winter . A lower number (like 0W or 5W) means the oil is thinner in cold weather, allowing it to reach critical engine parts faster during a cold start, which is when most engine wear occurs.
This represents the oil's viscosity at the engine's operating temperature (usually 100°C). A higher number indicates thicker oil that provides a stronger protective film under extreme heat but may slightly reduce fuel efficiency. 2. Choosing the Right Oil Type buy car engine oil
Buying engine oil is more than just a maintenance chore—it’s a deep dive into the lifeblood of your vehicle. To choose the right oil, you must decode the labels and understand how different formulations affect your engine's longevity. 1. Decoding the "Code" on the Bottle The "W" stands for Winter