How Does It Work



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Castrol Trizone Technology™ represents the 21st century approach to 4 Stroke (4T) motorcycle oils. Castrol 4T oils developed with Trizone Technology™ offer the protection needed to get the most out of your motorcycle.

The 4 Stroke motorcycle engine, unlike the car engine, has a very compact oil system, where the engine, clutch and gear zones are combined and use the same oil. The ideal 4T motorcycle oil has to meet the very different requirements in all three zones of the bike: “engine”, “clutch” and “gears”, as explained below;

A changing environment

Europe and US motorcycle riders consider it as a vehicle for leisure and week-end long drive purpose whereas in the Asia Pacific region, which is the largest 2 wheeler market, motorcycle is a daily commuter vehicle and often used as a family vehicle. Today’s high-precision, high performance four-stroke motorcycle engine provides many challenges for its engine oil. Generally consumers expect their engine oil to provide fuel efficiency and low emissions; power – performance & comfort; and durability of powertrain. 

Trizone Technology™ helps in addressing all three consumer demands from their motorcycles. 


Understanding Engine demands

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Compared with truck or car engines, motorcycle engines are much smaller and lighter but they produce a lot of power for their weight. Part of the secret lies in high engine speeds: a truck engine produces peak power at about 2500 RPM and a car engine at around 6000 RPM. Modern four-stroke motorcycle engines can rev up to 15,000 RPM or more.

The circulating oil comes under huge thermal stress as it transfers heat away from low mass components under high power conditions. High piston speeds and power output generate very high temperatures - with few places for that heat to go. Deposits can build up on the pistons and rings.  

Compact multi-cylinder multi-valve engines use complex oil circuitry with narrow oil-ways and enormous loads or pressures between the cam and follower. 

How Trizone Technology™ protects Engine

Trizone Technology™ oil uses high quality base oil and proprietary chemicals to adapt to a very wide range of operating conditions and demands: the right engine oil is one that keeps its shape and strength over time and in extremes of heat and cold which is achieved by using superior viscosity modifiers (a type of polymer). The detergent-dispersant balance must remove deposits and absorb contaminants (carbon, soot, acids etc.) to keep them in suspension, so that oil flows easily through small oil ways. It is also ensured that the chemicals used should not harm the protective coatings on engine parts.

The viscosity profile is so designed that it not only protects the engine parts but at the same time minimizes the drag thereby improving fuel efficiency and lowering emissions. 

Under Trizone Technology™, to ensure complete engine protection the oil is severely tested on actual motorcycle engines to provide superior power release, better wear control of engine parts and long term protection.

Four-stroke motorcycle oil isn’t just for engines - it also has to work in two other vital zones - the gearbox and clutch.


Understanding Clutch Demands

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When the clutch lever is pulled, the clutch plates are pushed apart, allowing them to slip - breaking the power connection between engine and gearbox. As the lever is released, the springs push the plates together again, allowing friction to feed power through the gearbox to the rear wheel.

Whenever that happens, those slipping and gripping plates generate an enormous amount of heat. If clutch plates and rings struggle to maintain grip, there could be clutch slippage leading to loss of power transmitted to wheels. On the other hand if clutch friction is high then the clutch may not smoothly engage or disengage causing shudder and uncomfortable feeling. 

How Trizone Technology™ protects Clutch

Oil with Trizone Technology™ is formulated with special additives to create adequate friction between clutch plates to grip properly and avoid loss of power and at the same time keep the clutch-plates healthy (low wear & tear). The viscosity profile here is chosen to cool the clutch and to prevent the bending and burning that would otherwise damage the rings and plates.

Trizone Technology™ oil is tested at Castrol Technology Centre on an actual motorcycle engine clutch.


Understanding Gearbox Demands

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The gearbox is another component of the motorcycle where high precision meets high stress. High precision means compact design, tight tolerances and the use of finely machined components for ultimate powertrain performance.

Increased stress comes through ever-increasing speed, power and narrower gear sets. These narrow gear sets mean huge pressures between the meshing teeth - adding additional stress.

During operation, the faces of the gears scrape against each other under load: this can cause scuffing or scoring of the gears, the teeth can knock and hammer against one-another. This creates sub surface stresses within the gears that can weaken the hardening on the surface of the teeth, making them vulnerable to pitting, the removal of material from the surface.

How Trizone Technology™ protects Gears

In motorcycles, high viscosities are needed to provide full gear protection. Castrol four-stroke motorcycle oils incorporate phosphorous-based anti-wear additives; active ingredients help to prevent metal-to-metal contact between the meshing gears. 

Heat tries to uncoil the polymers used in multi-grade oils and makes it more vulnerable to the high shearing action of the gears trying to tear it apart which is protected using Trizone Technology™.