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1978 XL250S - Which oil?


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I can see from the manual the manufacturers recommend SAE10-40, but which type? Nowadays the manufacturers (I've always stuck to Smith & Allen) seem to have semi synthetic and fully synthetic, other makes say there have a Mineral oil. It is all getting a bit confusing - especially when the same oil reservoir serves the engine, clutch and gearbox, a little guidance is needed.....



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