Oil Viscosity 1981 Eldorado 6.0

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The Classic Cadillac Forum Discussion, Oil Viscosity 1981 Eldorado 6.0 in Past Cadillac Vehicle Discussion; I'm using synthetic royal purple oil in all my vehicles. Based on the temperature chart in the manual and the ...
  1. #1
    mikedw7767 is offline Cadillac Owners Member
    Automobile(s): 1981 Eldorado 6.0
    Join Date
    Mar 2012

    Oil Viscosity 1981 Eldorado 6.0

    I'm using synthetic royal purple oil in all my vehicles. Based on the temperature chart in the manual and the temperatures I experience in California, it says to use 10w-40. I have two other newer cars that use 5w-30 and that's what is available right now. Will I get any benefit out of purchasing new, thicker oil? Or just use the 5w-30? The oil in there right now is clean and can wait another week for more to come in the mail, should I go ahead and put 5w-30 in there or wait and order another viscosity?

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  3. #2
    DouglasJRizzo is offline Cadillac Owners Enthusiast
    Automobile(s): 1975 hearse, 1976 hearse
    Join Date
    Nov 2010
    Franklin Lakes, NJ

    Re: Oil Viscosity 1981 Eldorado 6.0

    Most new vehicles want the 5w-30 oil. But the 6.0 in your 81 is a bit different. It doesn't have a roller cam like newer cars do for one thing. However, I don't think the 5w will hurt, but 10w is what the manual says and that's what I'd go with.
    Just me tho..

  4. #3
    77CDV's Avatar
    77CDV is offline Cadillac Owners 10000+ Posts
    Automobile(s): 77 CDV, 06 DTS III, 69 FWB
    Join Date
    Mar 2006
    Newbury Park, CA

    Re: Oil Viscosity 1981 Eldorado 6.0

    10w30 or 10w40 will do just fine.

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