Engine oil plays a crucial role in maintaining the health and performance of an engine. It lubricates the moving parts, reduces friction and heat, prevents corrosion, cleans the engine, and acts as a sealant.

The frequency of oil changes depends on several factors, such as the type of oil used, driving conditions, and the manufacturer's recommendations. Generally, it is recommended to change the oil every 5,000 to 7,500 miles or as per the vehicle's owner's manual.

Over time, engine oil gets contaminated with dirt, debris, and combustion byproducts. If not changed regularly, it becomes less effective in providing lubrication and protection to the engine components. This can lead to increased friction, excessive wear and tear, decreased fuel efficiency, and potentially engine damage.

It is generally not recommended to mix different types or brands of engine oil. Mixing oils with different additives and viscosity ratings can affect the performance and properties of the oil, reducing its effectiveness in protecting the engine.

Viscosity refers to the thickness or flow resistance of the oil. It is represented by a number and letter combination, such as 5W-30 or 10W-40. The first number (e.g., 5W) indicates the oil's viscosity at cold temperatures, while the second number (e.g., 30 or 40) represents its viscosity at operating temperatures. Choosing the right viscosity is crucial as it ensures proper lubrication and engine protection in different temperature conditions.

Yes, synthetic oil can be used in most modern vehicles. Synthetic oils offer improved performance, better resistance to breakdown, and enhanced protection compared to conventional oils. However, it's important to check your vehicle's owner's manual to ensure compatibility and follow the manufacturer's recommendations.

Most vehicles have a dipstick located near the engine. With the engine off, pull out the dipstick, wipe it clean, reinsert it, and then pull it out again to check the oil level. The dipstick usually has markings indicating the proper oil level range.

While engine oil itself does not directly improve fuel efficiency, using the correct oil that meets the manufacturer's specifications and changing it regularly can help maintain the engine's efficiency. Reduced friction and proper lubrication contribute to smoother engine operation, which can indirectly impact fuel efficiency.

It is generally recommended to use the oil specified by the vehicle manufacturer. They have designed the engine to work optimally with a specific type and viscosity of oil. Using the recommended oil ensures the best performance, protection, and longevity of your engine.