4.9L Oil Consumption
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HT4100 4.1, 4.5, 4.9 Discussion, 4.9L Oil Consumption in Cadillac Engine Technical Discussion; Folks: Just wondering how often you add oil to your 4.9L? Despite no significant leakage, I end up adding a ...
  1. #1
    EldoRedo's Avatar
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    4.9L Oil Consumption

    Folks:

    Just wondering how often you add oil to your 4.9L? Despite no significant leakage, I end up adding a quart about every six weeks -- this was true for the previous 4.9 I owned as well. (and no my exhaust is not blue!)

    Thanks.

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    drewsdeville's Avatar
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    Re: 4.9L Oil Consumption

    The 4.X's are pretty good about this topic. The bores and rings last nearly forever - and the valve guides and seals seem to be impervious no matter how old or how many miles. While the engines do have their issues (gaskets, fuel delivery on the fuel injected models), actual oil consumption isn't one of them.

    That said, for any old engine, a quart every month and a half isn't horrendous. At 20+ years old, some leakage, some burnage over that length of time is absolutely acceptable no matter what brand, no matter what engine.

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    Re: 4.9L Oil Consumption

    Unlike the Northstars, 4.9 engines use very little oil if any. My 1991 Seville needed a half a quart between changes but it had lots of leaks.

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    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: 4.9L Oil Consumption

    How many miles do you run in 6 weeks? I only drive 100 miles per week so that would be excessive. My 4.9 didn't need any oil between oil changes.

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    EldoRedo's Avatar
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    Re: 4.9L Oil Consumption

    I would guess about 1,400 miles in six weeks.

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    carnut is offline Cadillac Owners Master
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    Re: 4.9L Oil Consumption

    1400 is not excessive. How many miles on this car? Rather than guess, top off the oil, record the odometer miles, then when you need another quart, read the odometer and report back. Depending how you drive and sometimes the weight of oil used will have a bearing on oil consumption.

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    EldoRedo's Avatar
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    Re: 4.9L Oil Consumption

    OK I will try to do that. This is a rebuilt Jasper motor with about 45K on it. I use straight 30W.

    Thanks.

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    Straight 30? Why??? That's WAY too thick at startup/lower temperatures.

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    Re: 4.9L Oil Consumption

    That's the advice of my mechanic who replaced the motor. Have been using it for almost five years with no problems.

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    MoistCabbage's Avatar
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    The mechanic didn't engineer the engine. I'd recommend switching to the proper oil

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    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: 4.9L Oil Consumption

    Who makes straight 30 wt oil nowadays? I guess I do see it in truck oils but I can't think of any reason to use it. Most truck fleets have run 15w40 since the 80's. You wouldn't think straight 30 would cause excessive oil usage, but who knows because nobody else uses it. Mobil 1 10w30 will never ever hurt any engine. No need for old school oil or old school thinking.

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    Re: 4.9L Oil Consumption

    Most oil companies still make 30W; I can find it at any auto parts store (I typically buy Shell or Valvoline). While I appreciate the advice, my car has run just fine, as mentioned for five years.

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    Re: 4.9L Oil Consumption

    "Many custom-built engines have specialized parts that perform better with the single SAE 30 grade oil. Flat tappets, custom camshafts and other high performance parts may require a base oil that is not modified. Additionally, many racing engines may specify a specific grade rather than a multiple-grade oil. Follow your engine builder's instructions for oil use"


    Read more: http://www.ehow.com/info_12183518_ca...#ixzz2iUgFGyDD

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    Re: 4.9L Oil Consumption

    Maybe a happy medium here...like 15w-40? The distributor gear is not always lubed great on these engines. Still though..straight 30 in cold weather..sounds like a bad idea....

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    carnut is offline Cadillac Owners Master
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    Re: 4.9L Oil Consumption

    A car doesn't run better! or worse with regard to oil weight. Straight 30 in this engine IMO is not especially good for it mainly on cold starts. The thinner the cold weight of the oil, the quicker it gets to revolving parts on a cold start. Its been 2 months now and he's never seen fit to do the test I asked or if he did, never posted the result. I live in a climate that gets to 30 degrees in winter to 105 in the summer. I used 15/40 Rotella oil in my 4.1's and 4.5's because there was still some zinc to keep the cam in good shape. I say again 1400 miles on a qt. of oil is not indicative of a faulty engine.

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