Motor Oils

Check your vehicle owner’s manual for the manufacturer-recommended viscosity (e.g., 5W-30), then choose an oil with that grade; factors like climate and engine mileage can justify selecting a different viscosity within the manufacturer’s allowed range

Conventional oil is refined crude oil, synthetic blends mix conventional and synthetic base stocks for improved protection, and full synthetic oils use engineered base stocks that offer better high- and low-temperature performance and typically longer drain intervals

Follow the vehicle manufacturer’s recommended interval listed in the owner’s manual, which may range from 3,000–5,000 miles for older vehicles on conventional oil to 7,500–15,000 miles or more for many vehicles using full synthetic oil and modern maintenance monitoring systems

Yes — look for oils that meet API service classifications (e.g., SN, SP) and any OEM or regional specs noted in your owner’s manual (such as ACEA or manufacturer approvals) to ensure compatibility with engine design and warranty requirements

Mixing brands is generally acceptable in emergencies, but mixing oil types (conventional with synthetic) reduces some benefits of full synthetics; for best performance and predictable service life, use the same type and specification consistently

Additives (detergents, anti-wear agents, dispersants) and oil grade influence protection against deposit formation, wear, oxidation, and corrosion; choose oils whose additive package and API/OEM specifications match your engine’s needs

Look for oils that meet the required API/OEM specifications and the correct viscosity for your vehicle; budget options often include conventional and synthetic blend oils under common brand names, while average category prices may be around the mid-range of typical market offers