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Thread: OIL - I am old and ignorant, so please help me make sure of something.

  1. #1
    SissyBoyFloyd's Avatar
    SissyBoyFloyd is offline Cadillac Owners Member
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    OIL - I am old and ignorant, so please help me make sure of something.

    As I have read and tried to understand the different arguments in older threads and the technical archives about oil changes for the Northstar engine in the '99 Eldorado ETC, I want to make sure I understand it correctly.

    I take it that there is no need to change your oil before the info center tells you to, and that using synthetic oil is an absolute waste of money. Also, that it is natural for the engine to use oil and for you to have to add a fresh quart every so often in between oil changes. Now do I have that all correct? Or am I missing anything? I also assume one should change the oil filter at each oil change, or am I wrong on this one?


    PS. Since I just bought the car and don't know when the oil was changed last, should I just trust the current reading of the info display which says 85% still.

    Thx all.


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  3. #2
    vincentm's Avatar
    vincentm is offline Cadillac Owners Connoisseur
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    Re: OIL - I am old and ignorant, so please help me make sure of something.

    No need for synthetic, stick to what your manual and oil cap tell you. i change my oil every 3 months, regardless if i drive it everyday or not. And as a rule of thumb i change oil and coolant when getting a used vehicle, i'm picky like that.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: OIL - I am old and ignorant, so please help me make sure of something.

    You are correct on all counts Floyd.

  5. #4
    EcSTSatic's Avatar
    EcSTSatic is offline Cadillac Owners Master
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    Re: OIL - I am old and ignorant, so please help me make sure of something.

    Stick with the manual specs and OLM periods. I would not change it any sooner. Synthetic might save some gas, but unless you ignore the OLM and extend the oil change periods, that savings is used up in the extra cost of synthetic. That's my $.02. Basically, you have it correct.
    The PO might have reset the OLM to make it look like it was changed recently. It should look pretty clean at 85%. If it is, I would consider it accurate.

  6. #5
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Quote Originally Posted by SissyBoyFloyd
    I take it that there is no need to change your oil before the info center tells you to, and that using synthetic oil is an absolute waste of money. Also, that it is natural for the engine to use oil and for you to have to add a fresh quart every so often in between oil changes. Now do I have that all correct? Or am I missing anything? I also assume one should change the oil filter at each oil change, or am I wrong on this one?
    You are 100% correct on all points.

    A note on the OLM, replace the oil when it reaches 0%, but no longer than 12 months.

    PS. Since I just bought the car and don't know when the oil was changed last, should I just trust the current reading of the info display which says 85% still.
    I would definitely change it.

    Your engine uses 10W-30, 7.5 quarts with an oil and filter change. Correct level on the dipstick is half way up the hashmarks (xxxxxXxxxxx).

    ----------

    Quote Originally Posted by EcSTSatic
    Synthetic might save some gas,
    Using synthetic makes absolutely zero difference in gas mileage.

  7. #6
    dou1t2 is offline Cadillac Owners Member
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    Re: OIL - I am old and ignorant, so please help me make sure of something.

    I'm with vincentm on changing oil when buying a used vehicle. I suppose that someone could reset the oil life setting without actually changing the oil, thus misleading someone, although the oil when checked would be darker than a recent oil change would appear. my 2 sense!

  8. #7
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: OIL - I am old and ignorant, so please help me make sure of something.

    Quote Originally Posted by SissyBoyFloyd View Post
    As I have read and tried to understand the different arguments in older threads and the technical archives about oil changes for the Northstar engine in the '99 Eldorado ETC, I want to make sure I understand it correctly.

    I take it that there is no need to change your oil before the info center tells you to, and that using synthetic oil is an absolute waste of money. Also, that it is natural for the engine to use oil and for you to have to add a fresh quart every so often in between oil changes. Now do I have that all correct? Or am I missing anything? I also assume one should change the oil filter at each oil change, or am I wrong on this one?


    PS. Since I just bought the car and don't know when the oil was changed last, should I just trust the current reading of the info display which says 85% still.

    Thx all.
    --------------------------------
    I agree with Ranger - and MC -

    you are 100% CORRECT on all points -

    however - if you don't put many miles on the car -
    change the oil once a year -


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