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What is the unit of measurement for the HTHS rating?

What is the unit of measurement for the HTHS rating?

The lower the number, the lower the HTHS viscosity of the oil and the higher the anticipated fuel efficiency benefits. Measured in milliPascal. second (mPa. s), HTHS viscosity is also commonly referred to in centipoise (cP).

What does Hths mean in oil?

High Temperature High Shear
One way to improve fuel efficiency is the use of engine lubricants with lower HTHS (High Temperature High Shear) viscosity.

What is high Hths?

HTHS measures the viscosity (resistance to flow) of an engine lubricant at elevated temperatures under constant shear, simulating the narrow tolerances and high speeds between moving parts in a hot engine.

What is HT and HS viscosity?

What is HTHS? HTHS ( High Temperature High Shear) viscosity is the way we measure the ability of fully heated oil (150°C) to run efficiently between the narrow openings of fast-moving engine parts: for example, between piston ring and lining, valve train, gearwheel contact points, and so on.

What are saps in oil?

Low-SAPS Engine oil is an oil that has a low content of ash levels created from the burning of sulphated ash, phosphorous and sulphur which the acronym SAPS refer to. Different vehicle manufacturers can use different types of Low – SAPS Oils with different ACEA C Ratings, which can be found in your vehicle’s handbook.

What does CK 4 mean in oil?

What is CK-4 Oil? It’s the newest generation of diesel engine oil. Although it was developed especially for Tier 4 engines, you can use it in older models too. The industry calls that “backwards-compatible.”

How do you read oil viscosity?

The lower the number, the less the oil thickens in cold weather. The numbers after the “XW” indicate viscosity at 100 degrees Celsius and represent the oil’s resistance to thinning at high temperatures. For instance, oil with a 5W-30 grade thickens less than oil with a 10W-30 grade in cold weather.

How is motor oil viscosity measured?

The most common method for measuring kinematic viscosity is the use of a gravimetric capillary (Figure 1) that is usually temperature controlled at 40°C and 100°C for multigrade oils, and only 40°C for single grade oils.

What does low SAPS C3 mean?

C1 Low SAPS (0.5% ash) fuel efficient. 2. C2 Mid SAPS (0.8% ash) fuel efficient, better suited to higher performance engines. 3. C3 Mid SAPS (0.8% ash) less fuel efficient, even more in favour of performance.

What is low SAPS C3?

LOW SAPS C3 C3 oil is usually associated with the German car marques: BMW, Mercedes Benz, and VAG. C3 oil can have a 5W-30, 5W-40 or 0W-30 viscosity. In this example, clever oil technology has allowed the inclusion of the C2 performance level.

What is ci4?

API CI-4 oils are pivotal components in maintaining diesel engine durability using cooled EGR. API CI-4 is a higher quality oil than the previous diesel oil categories, so it will provide engine protection for both existing and new EGR engines.

What are oil viscosity numbers?

The higher the number, the thicker the oil. The lower the number, the thinner the oil. For example, a rating of 5W-30 means that the oil will have a viscosity rating of 30 at 212℉, or 100℃, (an engine’s average operating temperature).

What do the viscosity numbers mean?

So what do the numbers mean? The number preceding the W designates the viscosity at a low temperature, and the number following represents viscosity when the engine is hot. For example, a 10W-30 motor oil means the viscosity is at 10W when the engine is cold and 30 when the engine is hot.

How is viscosity measured?

Its unit of measurement is dynes per square centimeter (dynes/cm2). The fundamental unit of viscosity measurement is the poise. A material requiring a shear stress of one dyne per square centimeter to produce a shear rate of one reciprocal second has a viscosity of one poise, or 100 centipoise.

Which is better C2 or C3 oil?

Example – an ACEA C2 engine oil will provide better fuel economy that an ACEA C3 engine oil, but may not provide the same protection levels due to the lower film strength. ACEA C grade oils are for the most, not interchangeable with one another depending on the particular applications.

Is low SAPS oil better?

You need to use Low SAPS oil because Sulphated Ash, Phosphorous, and Sulphur are all substances that can build-up and block your vehicle’s DPF. This is why it is important to have an oil that is low in these substances, to avoid blockages.

What does C3 and C4 mean in oil?

C4 is a lower “SAPS” oil (Sulphated Ash, Phosphorous, Sulphur) specifically compatible with exhaust after-treatments such as DEF. C3 actually has better lubricity properties (because SAPS are a good thing extreme-pressure-wise), but may effect emissions.

How is HTHS viscosity measured?

One method used to measure HTHS viscosity is ASTM D4683, officially called the Standard Test Method for Measuring Viscosity of New and Used Engine Oils at High Shear Rate and High Temperature by Tapered Bearing Simulator Viscometer at 150 °C. Engine lubricant is introduced between a rotor and a stator at the test temperature of 150°C.

What is the SI unit of viscosity?

This is the SI unit of viscosity, equivalent to newton-second per square metre (N·s m–2). It is sometimes referred to as the poiseuille (symbol Pl). One poise is exactly 0.1 Pa·s.

What is low HTHS viscosity?

Today, HTHS viscosity—or specifically “low” HTHS viscosity—is a phrase fast becoming associated with increased fuel efficiency. The focus on HTHS viscosity is gaining momentum as it is regarded as the parameter of the viscosity classification that more accurately mimics the engine lubricants behavior in increasingly severe operating conditions.

What is the HTHS viscosity of engine oil?

The rotor experiences a reactive torque to the oil’s resistance to flow (viscous friction) and this torque response level is used to determine the HTHS viscosity. HTHS viscosity measured by ASTM D4683 correlates to the viscosity providing hydrodynamic lubrication in light-duty and heavy-duty engines.

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