2000 cadillac deville

why would a person change oil for this car from 10/30 sae to 15/40 diesel oil ?

2000 Cadillac Deville


1 thought on “2000 cadillac deville”

  1. It is difficult to answer for the actions of others. Many reasons someone might use 15w40 instead of 10w30. Should it ever be done? No, the engine was not designed for it.

    1) They may have only had 15w40 oil on hand.
    2) Someone dared them to do it
    3) An experiment
    4) old wives’ tale – in the old days if an engine started to knock or loose oil pressure some people would add thicker oil as a means to quiet the engine in an effort to prolong its life.. did it or does it work? NO it does not work. Once the damage is done, its done.

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