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Selecting the Right Oil

Oil is the lifeblood of your engine—keeping components lubricated, sealed, cool, and working efficiently, there is no replacement for this invaluable engine fluid. That’s why it’s important to regularly change your oil in order to eliminate dirt and to replenish chemicals and detergents found in the oil. You should also be aware of how different types of oil affect your engine.


Though it might seem simple, choosing the right oil is very important for proper engine performance. You should always select oil that meets the standards of the American Petroleum Institute (API), as well as fluids that meet the latest service requirements (currently denoted by the label “SL”).

Viscosity, or the fluid’s resistance to flow (“thickness”), is one of the biggest factors when you select oil. This is labeled using two numbers (for example, 10W-30). The first number represents the oil’s viscosity at 0° F (hence the letter “W,” which stands for winter). The second number represents the viscosity at 212° F. So, 10W-30 has less viscosity than 20W-50. Generally, the more resistant to thinning, the better it is for your engine, largely because this means oil will maintain a better film of lubrication.

Check your owner’s manual before selecting oil. 5W oil is usually suggested for winter use because they flow more easily in cold weather.

You should also consider synthetic or premium conventional oils. While convential oils are usually chteaper, synthetic oils have more additives and work well in critical areas. Synthetic oils are usually much more expensive, though.

If you're unsure of what oil you need or how to change your oil, schedule an appointment with Heritage Mitsubishi!
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