Rotella is an engine lubrication oil produced by Shell. The Rotella family includes coolants, gear oils, tractor fluids and engine oils. The four basic groups of Rotella oils maximise engine performance, reduce wear and deposits and decrease emissions. Rotella offers suitable grades for diesel engines, high-performance cars and motorcycles. Shell produces multigrade synthetic Rotella T Triple Protection oil and Rotella T6 --- a fully synthetic heavy-duty diesel engine oil.
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Viscosity measures an oil's the "flowability," meaning how readily it circulates through engine parts. An oil with too low a viscosity can shear and lose strength at high temperatures. Lower-viscosity oil may not pump to all engine parts. Manufacturers add polymers to light, base oils such as 5W to prevent them from thinning too much when they heat up. Rotella T6 has SAE viscosity grade of 5W-40 with kinematic viscosity of 87 at 40 degrees Celsius and a dynamic viscosity of 8,000 at -30 degrees Celsius. It provides protection under cold conditions but remains thick enough to protect at high temperatures.
This number, assigned to oils by the Society of Automotive Engineers (SAE), represents the oil's real viscosity at certain temperatures. Oils that meet specifications for winter use have a "W" included in their viscosity index, such as 10W, which has undergone testing at -20 degrees Celsius. Rotella T Triple Protection oils have SAE indexes of 135 for 15W-40 CJ-4 and 10W-30 CJ-4, indicating their ability to provide enhanced engine lubrication.
Flash point is the temperature at which oil gives off vapours that can ignite if exposed to a flame. The lower the vapour point, the greater the oil's tendency to burn off in hot cylinders; therefore, a high flash point is desirable. Rotella T6 has a flashpoint of 107 degrees Celsius, and Triple Protection oils have a flash point of 95.6 degrees Celsius.
Pour point represents -15 degrees Celsius above the point at which chilled oil shows no movement at the surface for five seconds when it undergoes an incline. This number represents the temperature at which oil will pump and maintain adequate pressure --- especially important in winter. The lower the pour point, the better. Rotella T6 has a pour point of -45 degrees Fahrenheit. Triple Protection oils have a pour point of -0-1.111 degrees Celsius.
Per cent of Sulfated Ash
Ash is the solid material left over when oil reacts with sulphuric acid and burns. This number quantifies the amount of metallic anti-wear and detergent additives in oil. Zinc dithiophosphate is a detergent added to decrease wear. Rotella T6 and Triple Protection Synthetic oils both contain 1 per cent sulfated ash.
Per cent of Zinc
This number represents the amount of zinc used as an anti-wear, extreme pressure additive. It only applies during actual metal-to-metal contact in the engine --- a rare occurrence of the oil works properly. However, zinc compounds do prevent wear and scuffing. A level of .11 per cent gives adequate protection with normal use. High-resolution, air-cooled motorcycles or turbocharged cars might need an oil with a higher zinc content.
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