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  1. cucvrus

    1984 cucv Engine oil type 6.2l diesel

    Like I said I am just copying from the manual. Makes no difference to me. Not sure why 10w30, 15w40, and 30w, would be good but they pointed out 10w40 as not good. just pointing it out for debate. Have a Great Day.
  2. cucvrus

    1984 cucv Engine oil type 6.2l diesel

    Everybody on here likes to quote technical information. This is from the GM 6.2 manual I have from GM school back in the early 80's. The GM 6.2 service manual did recommend 10W30 during the winter months. The manual did say to avoid the use of 10W40 engine oil but to retain 15W40/SAE 30 for hot...
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