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is SAE 10/40 still ok?

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  • Nessism
    replied
    No, modern oil is not thinner than old oil. Stay clear of auto oil though. Not enough zinc and phosphorus (high pressure additives). Get motorcycle or diesel engine oil. Shell Rotella is the forum favorite.

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  • CartoonLifeStyle
    started a topic is SAE 10/40 still ok?

    is SAE 10/40 still ok?

    After switching out the oil in my katana for a bunch of fresh semi synthetic sae 10w/40 oil, I've got blueish white smoke coming out of the exhaust.

    Before I switched the oil it was smoke free, is this modern oil too thin for these old beasts?
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