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Thread: adding oil between oil changes

  1. #1
    PA93STS is offline Cadillac Owners Member
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    adding oil between oil changes

    how much oil does the 4.6 northstar hold? its been 2500 miles since last oil change and i am in the "add range".. i knew i would need to be adding oil soon last i checked it was just at the line above add. is it normal at 2500 miles that my car would use that much oil.. i know its a quart every 750-1000 miles but i am not sure if i have used more than that. my oil life index is around 30. thanks!


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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: adding oil between oil changes

    Your (93 ???) Northstar is designed to hold 7.5 quarts of 10W-30 oil. The "Oil level" warning will come on at two quarts low. If your dipstick is at the "add" mark on the hashmark, then you should be at the 2-quart mark. Northstar oil consumption varies all over the map, so if you have used 2 quarts in 2500 miles, that's a quart each 1250, which is decent consumption for a Northstar. The 30% in 2500 miles is questionable. Do you do primarily short trip stop&go driving ? That's what kills engine oil. Maybe the oil life monitor was not reset. Reset it each time you change oil and filter.

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: adding oil between oil changes

    Go to the top left of this page and click on Technical Archives. Read up on OIL CONSUMPTION.

  5. #4
    PA93STS is offline Cadillac Owners Member
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    Re: adding oil between oil changes

    Ok thanks guys.. only 2 quarts is good news. what could the oil life index indicate if it was correct and at 36%?

  6. #5
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: adding oil between oil changes

    IF 36% is "correct" it says that the car never warms up and idles 90% of its running time. OR that the engine oil has been severely overheated one or more times......very unlikely.

    Your engine and the oil in it suffers more "wear" in a week of city driving than it does on a round trip from Maine to Florida.

  7. #6
    Ranger's Avatar
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    Re: adding oil between oil changes

    I don't understand the question.

    EDIT:
    Disregard. After reading Subs answer, I think I understand what you where asking and he answered.

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    PA93STS is offline Cadillac Owners Member
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    Re: adding oil between oil changes

    i do a lot of city driving. the most driving i do on the highway is 20 miles out, and back. other than that my trips are short and on roads with stop signs/traffic lights. i have never seen my engine temp. above 221 degrees, and that was when my heater core went and i was low on antifreeze.

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    Ranger's Avatar
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    Re: adding oil between oil changes

    my trips are short and on roads with stop signs/traffic lights.
    That is why it decrements so fast, especially in the winter.

  10. #9
    PA93STS is offline Cadillac Owners Member
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    Re: adding oil between oil changes

    Quote Originally Posted by Ranger View Post
    That is why it decrements so fast, especially in the winter.
    good to know.. thanks!

  11. #10
    jwanes is offline Cadillac Owners Member
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    Re: adding oil between oil changes

    Does teh oil consumption increase with colder temperature like at or below freezing?

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    Re: adding oil between oil changes

    The GM oil life system is based on revolutions and oil temp. If you overheat it it will degrage the oil. if it's too cold - never warms up, I think it calcs that as well. One time i got a change oil indication after only about 1000 miles after a change and found out that the primary engine cooling fan motor was burned out!! so it works!

  13. #12
    Ranger's Avatar
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    Re: adding oil between oil changes

    It actually takes much much more into account. Things like outside temperature, RPM, engine temp, throttle position, just to name a few. I think I have the detailed explanation at home and can post it if interested, but that won't be till late tonight or tomorrow.

  14. #13
    N*Caddy's Avatar
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    Re: adding oil between oil changes

    My car is driven daily 60 miles round trip 90% highway or roads with 55MPH speed limit and few traffic lights. I can say almost the ideal trip for the car. I drive the car pretty hard but after 3000 miles my oil life indicator is consistently ~54% - thatís when I change the oil.

  15. #14
    Ranger's Avatar
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    Re: adding oil between oil changes

    Quote Originally Posted by N*Caddy View Post
    My car is driven daily 60 miles round trip 90% highway or roads with 55MPH speed limit and few traffic lights. I can say almost the ideal trip for the car. I drive the car pretty hard but after 3000 miles my oil life indicator is consistently ~54% - thatís when I change the oil.
    That's about right. yours is capped at 7500 miles and if you followed the OLM, that's right about where you'd be when it told you it was time.

  16. #15
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    Re: adding oil between oil changes

    Quote Originally Posted by N*Caddy View Post
    My car is driven daily 60 miles round trip 90% highway or roads with 55MPH speed limit and few traffic lights. I can say almost the ideal trip for the car. I drive the car pretty hard but after 3000 miles my oil life indicator is consistently ~54% - thatís when I change the oil.
    so change at 54% or when the car says too?

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