Running full synthetic in 400,000 mile cummins

Discussion in 'Trucks and Trailers' started by weapons of grass destruction, Jun 16, 2011.

  1. weapons of grass destruction

    weapons of grass destruction LawnSite Member
    Messages: 228

    Hi I have 1994 cummins turbo diesel.
    And i found a good deal on amsoil.
    And changed the oil in it.
    What I am doing is changing just the filter every 6 months.
    And adding 2 quarts.
    But adding amsoil is way to expensive.
    So I heard it is not good to run full synthetic in high mileage cars. I was going to start to add start adding rottela t full synthetic.
    But it is not good to run full syn in high mileage cars.
    But amsoil I heard is different than other full syns.
    What do you guys think.
    Any help would be great.
  2. South Florida Lawns

    South Florida Lawns LawnSite Platinum Member
    from usa
    Messages: 4,784

    That amsoil is supposed to be good stuff. Look up a guy named nosparkplugs, on here he runs the dual bypass filtration system on his cummins. I think he went 89,000 miles without an oil change. Some guys will send off samples of their oil to a lab and it will still be perfect.

    Me I run rottela t full synthetic in my cummins change it every 6k. Chevron Delvac 15w40 is good also if you wanna run regular oil.
  3. mnglocker

    mnglocker LawnSite Senior Member
    Messages: 758

    @ 400,000 miles, just keep doing what ever you were doing and don't eff with it.

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