Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › 6bta 5.9 – what engine oil?

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  • October 11, 2021 at 8:49 am #121726

    Kevin Tisdall
    Participant
    Engines: Cummins 6bta 330
    Location: Milford CT
    Country: USA

    I’ve searched high and low – can’t find the oil spec for this engine but I have seen the capacity recommendations.

    What oil should I be using – viscosity and brand? Synth or non synth?

    –Kevin

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  • October 11, 2021 at 11:20 am #121739

    Kevin Tisdall
    Participant
    Engines: Cummins 6bta 330
    Location: Milford CT
    Country: USA

    Tom –

    extremely helpful – thanks much.

    –Kevin

    October 11, 2021 at 11:16 am #121737

    firehoser75
    Participant
    Engines: Cummins 6BTA M3-330 HP
    Location: Nanaimo, BC
    Country: Canada

    Kevin,
    I had a 2002 Cummins 6BTA M3 330 hp engine. I used Shell Rotella T4 15W40 regular oil (dino oil). No problems at all, and changed oil and filter before 200 hours or once per year (whichever came first).
    No need for synthetic as far as I know. Many other good brands if finding Rotella is difficult.
    Hope that helps,
    Tom

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