The first number of a multi-grade oil designates the ability for the oil to be pumped and flow at colder temperatures; the “W” stands for winter. Thus, a 0W oil will be able to flow faster and get to critical engine components better than a 5W or a 10W oil; especially in extreme cold conditions and at engine start-up.
The SAE 40 and SAE 10W40 is different motor oil. The main difference between these two lubricants is cold temperature viscosity. SAE 40 mono-grade oil has a lower viscosity index and higher pouring point temperature than the SAE 10W40 motor oil. This means multi-grade SAE 10W40 performs better in hot and cold temperatures than the monograde SAE 40.
Viscosity is the thickness of oil at a given temperature. As temperatures increase, viscosity increases. The 10w40 is considered to be less viscous at higher temperatures when compared to 15w50 oil. What this means is that the 15w50 will perform a lot better in higher temperatures.
For instance, SAE 5W-30 oil flows better at colder temperatures than 10W-40 oil. But, SAE 10W-40 oil is thicker. It provides better protection in warmer weather compared to SAE 5W-30. Multi-viscosity engine oils don’t behave the same. It depends on the operating temperature. A multi-viscosity oil provides good flow in cold weather and The Bel-Ray EXP Synthetic Ester Blend 4T Engine Oil SAE 15W-50 and Thumper Racing Synthetic Ester Blend 4T SAE 15W-50 are both premium lubricants and share very similar formulations, but the Thumper formula was specifically made to address certain concerns better with single cylinder off-road applications that have a low volume of oil (less No difference between 10w-40 and 15w-40 in terms of how well it will look after your engine except at startup. The 15w and the 10w just refers to how thick the oil is when cold. Once warmed up both oils are the same viscosity i.e. look after your engine just as well. Nissan specified 7.5w-30, so a 40 weight oil is better for a hard pressed 10w40 motor oil is a bit more expensive than 15w40 motor oil. 10w40 is thus an ideal motor oil for the moderate engine, such as light vans, SUVs, and passenger cars. If your car is a highway fleet that needs regular oil replacement 10w50 is much preferred as an ideal budgeted oil. Saratoga, NY. Dec 20, 2005. #4. Chico, the difference between oils labeled "4 cycle motor oil" for outdoor power equipment use and modern PCMOs (passenger car motor oils) is (mostly) the additive package. Current PCMOs have less zinc and phosphorous in their formula to protect catalytic converters and comply with tighter emissions standards.

Shell Rotella T5: The Rotella T5 that comes in two viscosity grades 10W-30 and 15W-40 is a synthetic blend of heavy-duty engine oil that uses a combination of synthetic base oils and state-of-the-art additives. It can withstand extreme weather conditions especially in winter and help protect your engine.

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    • difference between 10w and 15w oil