Castrol South Africa’s Expert Answers: Bike and Motorcycle Oil

Watch as our Castrol oil expert answers your bike and motorcycle oil questions. Learn about different kinds of oil, your oil filter and oil viscosity so that you can improve your bike’s performance and get the edge on your competitors. Select a question and read or view the video to hear to answer.

Can I use a car engine oil in a motorcycle?

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Modern motorcycles have a high power density which car oils have not been designed for. The compatibility of car oils and motorcycles have not been tested for use with wet clutches and the heavily loaded gears in modern bikes and motorcycles.

Can I use car oil if I have a dry clutch?

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Car oil may not provide a motorcycle with enough high-temperature protection, lubrication and gearbox protection, even in the case of dry clutch application.

What is the purpose of engine oil in a motorcycle?

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In a motorcycle, engine oil acts as a lubricant for key components, thereby reducing wear and tear and dispelling heat from the engine and clutch.

What are the most critical oil flow areas?

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The piston assembly, bearings and valve train, along with protection of the gearbox, lubrication and cooling of the clutch are critical aspects of the engine which require oil.

What is the purpose of the oil filter?

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Normal motorcycle riding tends to introduce debris and foreign particles into the oil. The oil filter traps these particles in order to prevent engine damage. If an oil filter becomes blocked, the engine can suffer oil starvation, in worst case scenarios this may result in engine failure.

Is engine oil only for engine protection or can it also improve performance?

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Engine oil works by reducing the friction inside an engine which in turn improves the efficiency of the engine and ultimately improves the engine’s performance. This process is usually achieved with the use of friction optimised oils which have a low viscosity.

Why do some OEMs (original equipment manufacturers) recommend low viscosity oil?

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OEMs (original equipment manufacturers) are familiar with the manufacturing processes used in the creation of car parts and they have identified the need to produce more fuel efficient engines.

What kind of oil is used in MotoGP engines?

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Road oils are very different to the oils used in MotoGP engines. Castrol Power 1 oils are produced using the same techniques used for developing high-performance MotoGP oils.

Can I use Castrol motorcycle oil at extreme outdoor temperatures?

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The high performance base oils used in multi-grade engine oils are developed to ensure that the oil flows easily and doesn’t evaporate or burning when subjected to either low or high temperatures.

Can a track day oil be used for road driving?

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Track day oils are specifically engineered to enhance performance over short periods of time so they may not be suitable for long drain use, for this reason track day oils are not recommended for road driving.

What does the term deposit mean?

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A by-product of combustion, deposits are usually the formation of carbon on pistons and other components. These deposits may lead to a lack of compression over time.

What impact does thick oil have on the car components?

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In modern cars, the engine, gearbox and clutch are designed to operate with thinner oils. For this reason thicker oils are likely to compromise the performance of your modern engine.