Grade of oil
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500, 472, 425, 368 Discussion, Grade of oil in Cadillac Engine Technical Discussion; What wate of oil do you use in your big block? My self im using W 10/30....
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    limousine rider's Avatar
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    Grade of oil

    What wate of oil do you use in your big block? My self im using W 10/30.

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    Re: Grade of oil

    I used 10W-30 in my 425.... if i had to do it again I would use Mobil Delvac 15W-40

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    Re: Grade of oil

    I use straight 30 weight whenever possible, for some reason I have a hard time finding it sometimes. If I can't get 30W I get 10W-30... but it really does seem a bit thin for these engines.

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    Re: Grade of oil

    Quote Originally Posted by eldorado99 View Post
    I use straight 30 weight whenever possible, for some reason I have a hard time finding it sometimes. If I can't get 30W I get 10W-30... but it really does seem a bit thin for these engines.

    eldorado99 You can try to get hold of it via a store for heavy equippment. I know that straight 30 motor oil is demanded and used in some heavy equippment as hydraulic oil.
    I dont know what size container that is aviable but maybe 20liter.

    jolle

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    Re: Grade of oil

    Quote Originally Posted by fleetwood76 View Post
    eldorado99 You can try to get hold of it via a store for heavy equippment. I know that straight 30 motor oil is demanded and used in some heavy equippment as hydraulic oil.
    I dont know what size container that is aviable but maybe 20liter.

    jolle


    Thanks jolle, I probably should try that, I have a friend who is a mechanic at a fork lift servicing shop, they probably have some. The 10-30W really does seem too light to me.

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    Re: Grade of oil

    Advane sells stright 30

    but I'd advise against it... multi-viscosity oils are far superior for a non-race car.

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    Re: Grade of oil

    Given that new oils have a bunch less zinc, which older engines like, in a 1970 model I'd run a 15w-40 diesel oil that still has zinc or 10w-30 or 40 with STP Oil Stabilizer that contains extra zinc.
    Apparently the zinc was contaminating catalytic convertors, which pre-1975 models do not have anyway.

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    Re: Grade of oil

    Quote Originally Posted by JohnnyO View Post
    Given that new oils have a bunch less zinc, which older engines like, in a 1970 model I'd run a 15w-40 diesel oil that still has zinc or 10w-30 or 40 with STP Oil Stabilizer that contains extra zinc.
    Apparently the zinc was contaminating catalytic convertors, which pre-1975 models do not have anyway.
    I've been wondering about diesel oil for my '70, but I've also been told to stay away because of the intense detergents in it.

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    Re: Grade of oil

    yah i dont think diesel oil is a good idea!

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    Re: Grade of oil

    Always ran 10W-30 dino oil (usually Shell or Valvoline) in my 368. Never burned any oil. Not sure if the requirments are different for the larger 425, 472, or 500.

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    Re: Grade of oil

    Delvac, Delo or Rotella is a very good oil, if I still had my 425 today it would be getting 15W-40 Delvac.

    Very good oils.

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    Re: Grade of oil

    Before my rebuild I used 20W-50 with STP oil treatment added because the rings were so worn!!!

    Now I use 10-30 or 15-30. Sometimes I throw a quart of 20W-50 in as well. You can mix them with no problem. Boy has oil gone up $$$ in the past 2 years!!!!

    I read about some additive that has dissappeared from oil, I'm not up to speed on the whole thing though... I hope my new engine doesn't get ruined!

    I don't ususlaly hunt for certain brands - they all have to meet API service requirements.

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    97Eldorado97 is offline Cadillac Owners Member
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    Re: Grade of oil

    Hello, I was curious if anyone knew the best oil to use for my 1997 eldorado. Which oil is used normally for this year car?

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    Re: Grade of oil

    Quote Originally Posted by 97Eldorado97 View Post
    Hello, I was curious if anyone knew the best oil to use for my 1997 eldorado. Which oil is used normally for this year car?
    You are in the wrong section, this is for the older big blocks, here is the Northstar section:

    http://www.cadillacforums.com/forums...al-discussion/

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    Re: Grade of oil

    thanks for the link...

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