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Detroit Diesel 6-71

Discussion in 'Engines' started by Keep on Reeln, Jan 12, 2025.

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  1. Keep on Reeln, Jan 16, 2025
    #21
    Keep on Reeln

    Keep on Reeln New Member

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    Thank you More great info from you.
  2. Capt J, Jan 16, 2025
    #22
    Capt J

    Capt J Senior Member

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    Fort Lauderdale
    MANN also makes good filters, but for the little price difference I stick to dealer filters.
  3. LM Viking, Jan 17, 2025
    #23
    LM Viking

    LM Viking Member

    Joined:
    Sep 20, 2018
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    Location:
    Michigan
    My Viking 44 motor yacht has been running it’s DD 6-71TIBs since at least 2000 on Rotella T1 40w
    The oil is changed every year except on a year I hardly used the boat. 5 hrs. I just don’t run them on the pins. Have owned her for 6 years and previous owner had her since 200o. Same guys have taken care of her since PO purchased
    Starts right away and smokes for just a few seconds. No major problems. I boat in northern lower Michigan. Only use the black heaters in early spring.
  4. Capt Ralph, Feb 1, 2025 at 5:23 PM
    #24
    Capt Ralph

    Capt Ralph Senior Member

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    Update;
    Was just working with my vendor on another Delvac 40 order.
    Discovered I typed wrong on this and another post.
    Mobil 1640 is CF rated.
    Still, 1240 is CF-2 rated.

    Bottom line, if using Mobil products, use the 1230 or 1240 for Detroit two stroke engines.

    I am sorry for my bad data on earlier post.:(

    Last order July 2023. Another 10, 5-gal pails coming in.
  5. Robertoman, Feb 1, 2025 at 8:15 PM
    #25
    Robertoman

    Robertoman Member

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    Dec 15, 2010
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    Location:
    San Diego
    Delo 100 40w is what I use.
    I haven't had any problem finding it.
    I think my motors like it!
  6. Capt Ralph, Feb 1, 2025 at 8:59 PM
    #26
    Capt Ralph

    Capt Ralph Senior Member

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    Yep, Delo 100 is CF-2 rated.
    Like my post #2, I have used many oils for my customers. At those times, Chevron Delo 100 just did not offer any discounts.
    Now that we have closed shop, I shop just for our Bertram.
    This year, our Mobil distributor in Jax came thru again. Their truck should be dropping on us next week.
  7. Robertoman, Feb 2, 2025 at 8:45 PM
    #27
    Robertoman

    Robertoman Member

    Joined:
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    Location:
    San Diego
    The specs on the Mobil 1640 are good!, and the price is reasonable. Thanks for the info.
    I always used Delvac 15w40 in my Cat motors (purchased from walmart $) and it performed as well as the CAT brand oil.
    I never knew that Mobil made CF 2 oil.
    I learned something today!
    thanks.
  8. Capt Ralph, Feb 2, 2025 at 8:50 PM
    #28
    Capt Ralph

    Capt Ralph Senior Member

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    Please re-read post #24.
    For Detroits you want Mobil Delvac 1240, Not 1640.
    Robertoman likes this.
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