Its operating temperature range is more common than the 10W-40 viscosity grade. The 10W30 engine oil is a versatile oil for most situations. 10W-30 synthetic oil might very well outperform a 10W-40 conventional oil in protecting your engine bearings and pistons. Synthetic oil is known to provide better engine protection and temperature stability. While they’re very similar oils, there are still performance differences, especially between conventional and synthetic motor oil. Some contain friction modifiers that help improve fuel economy by reducing friction, or detergents that keep the engine clean.īoth of these oil ratings are also available in purely conventional oil form or better-quality synthetic grades. Multigrade oils like 10W-30 and 10W-40 contain polymers that speed up or slow down their thickening and thinning rates as temperature fluctuates. Consider engine longevity and pick the motor oil that’ll protect it best. However, you shouldn’t use this oil type for fuel economy if it’s unsuited to your vehicle or driving conditions. It’s also more commonly available, so it’s cost-effective. Fuel EconomyĪ thin oil flows faster through the engine, reducing drag, and requires less energy for your oil pump to push, so it’s more fuel-efficient.įollowing that line of thought, the thinner 10W-30 oil weight offers better fuel economy than 10W-40 motor oil. But be aware that as it’s a thinner oil, it might not lubricate engine parts as well as 10W-40 as temperatures continue to increase. That said, you can still use 10W-30 motor oil in warm weather. This higher viscosity oil is designed for hotter temperatures and can handle the added heat stress from the environment. So, if you drive in a warm climate - especially more than 32☌ (90☏) - or have an engine that runs hotter than others, 10W-40 oil viscosity is a good option.
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