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Castrol Bike

API 4 Stroke Oil

For petrol, listings start with 'S' (meaning Service category, but you can also think of it as Spark-plug ignition), followed by another code to denote standard.

Opie Oils stocks a wide range of API (American petroleum institute) specification 4 stroke motorcycle engine oils. The most current and up to date specifications are listed below, however there are number of specifications that are commonly searched for but have become obsolete SG / SF / SE / SD / SC / SB / SA. If you require any of these obsolete specifications or you are in any doubt of what oil is correct for your bike please get a recommendation from our expert team.

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