running unleaded in a classic caddy
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500, 472, 425, 368 Discussion, running unleaded in a classic caddy in Cadillac Engine Technical Discussion; i bought a 1962 caddy coupe deville and i don't know what gas i should use, i would assume 93 ...
  1. #1
    90devilleguy's Avatar
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    running unleaded in a classic caddy

    i bought a 1962 caddy coupe deville and i don't know what gas i should use, i would assume 93 octane(my area), but do i need a additive for the lead?

    picking up car today, need to know soon!!!

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    Re: running unleaded in a classic caddy

    You can do a number of things here. First of all, if you are sure that the engine is original and that the valves require lead lubrication there are a number of lead substitue products available at most any parts store.

    As far as which octane? I would start with 87 octane and a bottle of octane booster on hand. See how it runs with that, if you get pinging add the booster and next tank full go with 89 and booster on the side. Unless you prefer to run 93 anyway. (We can only get 91 here in CA)

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    Re: running unleaded in a classic caddy

    DOH! I forgot to add, why not ask the seller (assuming they are the ones who have been driving the old girl) which grade of gas they've been using?

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    Re: running unleaded in a classic caddy

    Quote Originally Posted by Kev
    DOH! I forgot to add, why not ask the seller (assuming they are the ones who have been driving the old girl) which grade of gas they've been using?
    i will, the car was from california so i don't know

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    Re: running unleaded in a classic caddy

    IIRC the 390 is a 10.5:1 motor... you can try running 86 by retarding the timing several degrees, then slowly inching it back towards normal. If it pings before you get to full advance, you need to run a fuel with a higher octane rating.

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    Re: running unleaded in a classic caddy

    I curious about the octane grades available in other areas. Here in California we can get 87, 89 and 91.

    Davesdeville mentioned 86, was that a typo or is that regular grade in NM?
    90devilleguy mentioned 93, I've heard of that, I'm jealous!

    What is available for mid-grade?

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    Re: running unleaded in a classic caddy

    We have 93 here

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    Re: running unleaded in a classic caddy

    Quote Originally Posted by terrible one
    We have 93 here
    Is that all? Just 93? Or do you have regular and mid-grade too?

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    Re: running unleaded in a classic caddy

    Quote Originally Posted by Kev
    I curious about the octane grades available in other areas. Here in California we can get 87, 89 and 91.

    Davesdeville mentioned 86, was that a typo or is that regular grade in NM?
    90devilleguy mentioned 93, I've heard of that, I'm jealous!

    What is available for mid-grade?
    mid grade is 89 in mass, and we used to up to last year have 94 octane at sunocos

    they still have race fuel at some stations but a very limited amount,plus it's like 10 bucks a gallon i'm told

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    Re: running unleaded in a classic caddy

    We have 86,87,89, 91, 93, and 94. In MI we also have racing fuel which is 104 or 107 I think.

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    Re: running unleaded in a classic caddy

    86 is regular in NM, we get 86/88/90-91. Thanks to the high altitude of over a mile above sea level...

    104 is the highest unleaded fuel readily available (VP.)

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    Re: running unleaded in a classic caddy

    I wouldn't worry about the lead additives....just run the lowest octane that you can without it pinging. On a higher compression engine, it may take 93. If it runs fine on 87, run 87.
    Like addison_ii in Michigan, in Ohio we have 86-94 for road use gasoline.

  14. #13
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    Re: running unleaded in a classic caddy

    Quote Originally Posted by lux hauler
    I wouldn't worry about the lead additives....just run the lowest octane that you can without it pinging. On a higher compression engine, it may take 93. If it runs fine on 87, run 87.
    Like addison_ii in Michigan, in Ohio we have 86-94 for road use gasoline.
    well i'm gonna stick with 93 for now since i filled it, 26 gallons tank>>>>>>>>>>>>me

    then i'll check the timing some time this week, and if it's ok then i'll leave it be if it's not then i'll try some lead additive

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    Re: running unleaded in a classic caddy

    Kev, no not just 93. That's the premium.

    We've got 86 for regular, 89 for mid grade, and 93 for premium. Guess which one I'll be running...

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    Re: running unleaded in a classic caddy

    Quote Originally Posted by Kev
    I curious about the octane grades available in other areas. Here in California we can get 87, 89 and 91.

    Davesdeville mentioned 86, was that a typo or is that regular grade in NM?
    90devilleguy mentioned 93, I've heard of that, I'm jealous!

    What is available for mid-grade?
    Kev, you can thank CARB (California Air Resources Boars) for your lack of higher octane fuel. I believe it was in 96 or 97 that they determined that swithching from 92 to 91 as the higest standard octane avaliable would cut down on polutants by X ammount of ppm. Other than The Peoples Republic of California and some communist states in the norhteast, Octane avaliability is based on average elevation. In NM, you may have 85 as the lowest octane, and 90 as the highest, but have no fear, becuase the elevation is higher, fuel has a harder time burning anyways so it needs less octane (resistance to burn) than usual. Ran 85 octane in a 97 Chevy lumina 3.1 v6 and got 34 mpg and made it from albequerque to Willams AZ on a tank. Here in TN we have 87/89/93. If you really want some high octane gas in CA, Certain Unocal 76's have the racing gas, you just have to find one, the one my dad ran in riverside, on the way to the desert had it, and most the ones ive stopped at in the desert have it, but im sure with the import race scene there, you could find it at more urban locations too.



    -The Cadillac Rancher
    a California native

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