MOTOREX Top Speed 4T: What’s in the bottle?

# What the product is MOTOREX Top Speed 4T is a range of synthetic performance motorcycle oils offered in four viscosity grades: 5W/40, 10W/30, 10W/40, and 15W/50. The range is presented for street, adventure, and medium-to-large-capacity engines where the manufacturer specifies those viscosities.

# What's in the bottle The formulation combines MOTOREX's Molecular Converted base technology with PAO and ester components. The company positions those ingredients to form and maintain a protective lubricating film as engines work hard and temperatures rise.

Thermal stability and shear stability are the stated performance priorities. Practically, that means the oil is designed to resist viscosity changes caused by heat and mechanical stress. MOTOREX also cites low NOACK volatility, which is a measure of evaporation loss at high temperature and can influence oil consumption.

# Wet-clutch compatibility Every grade in the Top Speed 4T line carries JASO MA2 approval. That standard addresses friction characteristics required for wet multi-disc clutches that share oil with the engine and gearbox. JASO MA2 approval indicates the oil meets required friction levels to avoid clutch slippage or grabbing in such systems.

# The grades and when they apply

• 5W/40: Lowest winter viscosity in the range with a 40 rating at operating temperature. Intended for motorcycles that specify that cold-start behavior plus a 40-grade operating viscosity.

• 10W/30: The 30-grade operating viscosity option for engines designed around a lower operating-temperature viscosity. Suits various four-stroke applications that call for 10W/30.

• 10W/40: Positioned as an all-rounder that covers a broad spread of road, adventure, and off-road applications where 10W/40 is specified. Balances wear protection with resistance to heat and mechanical load.

• 15W/50: The highest operating-temperature viscosity in the range. Suited to medium-to-large-capacity engines specified for that grade, with emphasis on maintaining lubrication under sustained heat and load.

# How to choose the right grade Start with your motorcycle handbook. Match both the cold-start viscosity number (the W-rating) and the operating-temperature viscosity number to the manufacturer's specifications. Also follow any manufacturer guidance about temperature range and riding conditions. The oil grade selection depends on the engine's requirements rather than displacement alone.

# Packaging and availability Top Speed 4T is available in one-litre and four-litre packs. In Australia, MOTOREX is distributed by A1 Accessory Imports and sold through motorcycle dealers.

# Practical implications for riders Using a grade that matches the handbook preserves expected lubrication behavior and clutch performance. Thermal and shear stability and lower NOACK volatility aim to reduce viscosity drift and evaporation losses when the engine sees sustained high temperatures. JASO MA2 approval reduces the risk of wet-clutch friction issues in motorcycles that rely on engine oil for clutch lubrication.

# Bottom line Top Speed 4T is a focused synthetic motorcycle oil family combining MOTOREX base technology with PAO and esters across four viscosity choices. The line emphasizes stability under heat and load plus wet-clutch compatibility. Choose the grade based on the motorcycle manufacturer's specified viscosities and performance guidance.