Castrol Activ 4T 20W-40 Synthetic Technology Engine Oil 1L

Castrol Activ 4T 20W-40 Synthetic Technology Engine Oil 1L is a 20W-40 oil made for four-stroke motorcycles, available in Bangladesh. Compare model name, viscosity and pack size together before choosing.

This bottle of Activ 20W-40 is labelled Synthetic Technology. It's the motorcycle 20W-40 grade — not Activ Scooter, and not a generic mineral oil.

Castrol builds its Activ oils around Actibond, aimed at limiting wear, deposit build-up and corrosion. Note that a "Synthetic Technology" label is not proof of whether this particular version is full or semi-synthetic.

Both 20W-40 and 10W-40 share SAE hot-viscosity class 40; only the low-temperature class differs. These numbers aren't a temperature guide — pick from the viscosity range your manual permits.

The pack holds 1 Litre. Don't treat that as your fill quantity — an oil-only change, a change with a new filter and a dry build each call for a different amount. Your bike's manual gives the real number.

Your manual sets the API grade and JASO clutch standard the oil must meet — check both on the label first. Then follow its service interval, and the shorter severe-use schedule if you ride mostly short hops or in dense traffic.