The Synthetic 5w-40 just says that the 40 weight oil will maintain a 40 weight viscosity down to 5 degrees vs. 15 degrees for the conventional. FWIW, I saw absolutely no difference between Rotella conventional and synthetic excpet about $10/gallon less money in my pocket for the Rotella Synthetic.
First of all, 10W30 oil is effective in cold temperatures, while 15W40 is effective at high temperatures. Similarly, you will also get the differences in viscosity, additives, protection, cost, and so on. However, this article helps you get core information about 10W30 and 15W40 and provides advantages and disadvantages.
The oil weight is its viscosity index at 100 degrees C (the boiling point of water). Low viscosity motor oils that pour easily at low temperatures typically have a 0W, 5W or 10W rating. There are also 15W- and 20W-grade multi-weight motor oils. Higher viscosity motor oils that are thicker and better suited for high-temperature operation may Many medium and large fleets are ditching 15W-40 heavy duty engine oil (HDEO) for 10W-30 HDEOs. According to a recent study about 20% of medium and large fleets are now using 10W-30 HDEO (Power Systems Research, 2014). The most common reason for the change is the increase in fuel economy by switching to lower viscosity oil. 10W30 HDEO | $479.00 If the 0w30 motor oil and 10w30 motor oil are heated up, these motor oils will have the same viscosity. The advantage of a 0w30 motor oil is that the number zero is far from thirty (30) than ten (10). On the other hand, the 0w30 motor oil will break down faster than the 10w30 motor oil. So in using 0w30 motor oil in replacement to the 10w30
10W-30 synthetic oil’s range is between -25°C/-13°F to 30°C/86°F (sometimes -30°C/-22°F to 35°C/95°F) while a 10W-40 is from -30°C/-22°F to 40°C/104°F. Inside your engine, both oil formulations can withstand temperatures of up to 100°C/212°F. But you know which oil type will work better.
Description. The viscosity grade of a lube oil is determined by the Society of Automotive Engineers (SAE). Oils can be separated into multigrade oils and monograde oils. Multigrade oils must fulfill two viscosity specifications, their viscosity grade consists of two numbers, e.g. 10W-40: 10W refers to the low-temperature viscosity ("Winter Fetch your cloth. Sep 16, 2011. #2. 10W (6.1cSt viscosity @ 100 degC) is right in between an ISO 32 (5.4cSt @ 100 degC) and ISO 46 (6.7cSt @ 100 degC). So if your spec calls for 10W you might possibly run into overheating issues if you use ISO 46. Shell Rotella meets or exceeds current CK-4 and other standards. 5. High viscosity oil is best. With Shell Rotella T5 10W-30 synthetic blend, you get the strong wear protection of a 15W-40 with the added benefit of fuel savings. 1. In addition, Shell Lubricants has introduced Shell Rotella ® T6 10W-30 full synthetic heavy duty engine oil .
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    • difference between 10w and 15w oil