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  1. #1
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    Any problems running 5W-30 instead of 10W-30

    Ok today i got an oil change for my 3.5L at a quick lube place and switched to Mobil synthetic oil at the same time but they mistakenly put in 5W-30 instead of the recommended 10W-30. Is there any problems i may have running this weight? I'm about to park my car for the winter anyways.



  2. #2
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    Being winter you may be ok. Thinner oil is more prone to cause premature engine component wear due to insufficient ability to hold oil on surfaces long enough for sufficient protection.
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  3. #3
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    your engine should be fine. just go back to 10W30 in the spring.

    some of the best info on engine oil can be found here.
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    ensure brain is in gear before engaging mouth.

  4. #4
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    the 3.5 used to be rated for 5w30 way back when it was introduced in 93, nothing really ground breaking has changed that would hinder the use, especially since it is mostly the "cold" viscosity that is thinner, not the operating viscosity. at one point i believe it said in the service manual that you could use either depending on your climate. but like fnky said, switch back in spring.
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  5. #5
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    Thanks guys. I was just worried when i do start driving it again in the spring. This is a fresh oil change, do you think it'll be ok to run until my next oil change when i start driving it again? If i can, i'll change it sooner. Just don't want to run it if its going to prematurely wear down my engine. Not worth the risk if so.

  6. #6
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    Just something to Ponder. I did not write this but it did help me to understand,
    WHAT DO THE NUMBERS MEAN?
    Most people believe that a 5w30 oil is good for cold weather use because it is a "5 weight" oil in cold
    temperatures and a "30 weight" oil at high temperatures. On the surface this might seem to make a
    certain amount of sense. Naturally, a "5 weight" oil would flow better than a "30 weight" oil. This would
    make it ideal for cold temperature operation.
    Nevertheless, this is a profound misunderstanding of what the labeling means. The two numbers really
    have little to do with each other. The final number based upon the kinematic viscosity at 100 degrees C,
    MONOGRADE OILS
    MULTI-VISCOSITY OILS
    as we discussed for monograde oils.
    So, if a multi-grade oil, when heated to 100 degrees C, falls within a certain kinematic viscosity it is
    classified as a certain SAE grade (the last number - like the "30" in 5w30). In other words, the kinematic
    viscosity of a 5w30 multi-viscosity oil falls within the same range at 100 degrees C as a monograde
    SAE 30 weight oil does.
    A multi-viscosity oil also has to meet a "High Temperature/High Shear" requirement, but I'll talk about
    that in a minute.
    The first number (the "5" in 5w30) is only a relative number which basically indicates how easily it will
    allow an engine to "turn over" at low temperatures. It is NOT a viscosity reference. In other words, a
    10w30 is NOT a 10 weight oil in cold temperatures and a 30 weight oil in warm temperatures.
    In fact, since SAE viscosity classifications only apply to an oil at 100 degrees C, it doesn't even make
    sense to label it as a certain SAE viscosity at any temperature other than 100 degrees C.
    Besides, if you thought about it for a second, it wouldn't make sense for a 10w30 oil to be a 10 weight
    oil in the cold and a 30 weight oil in warm temperatures. What liquid do you know of that gets "thicker"
    as its temperature increases or "thinner" as the temperature decreases?
    I would venture to say you probably can't come up with one. This holds true for motor oil as well. If a
    10w30 was a 30 weight oil at 100 degrees C and a 10 weight oil at cold temperatures, that would mean
    it "thinned out" as the temperature dropped. That just doesn't make any sense considering what we
    know about liquids. It just doesn't happen like that.
    The fact is that a 5w30 motor oil is thicker in cold temperatures than in warm temperatures. However,
    a 5w30 motor oil will be thinner than a 10w30 motor oil when subjected to the same low temperature
    conditions - because the "W" number is lower. This is an indication of better cold weather performance.
    In other words, a 5w30 flows better in cold weather than a 10w30 motor oil will. Think of the "W" as a
    "winter" classification instead of a "weight" classification.
    Results from the Cold Crank Simulator (CCS) and Mini-Rotary Viscometer (MRV) tests are used to
    determine the oil's "W" grade. The better the engine "startability" of the oil at low temperature, the lower
    the W classification. Each W grade must meet certain "startability" requirements at a specified
    temperature.
    For instance, a 0W grade oil must have a maximum CCS centipoise (cP) value of 3250 @ -30 degrees
    C as well as a maximum MRV cP of 60,000 @ -40 degrees C. A 5W grade oil must have a maximum
    CCS cP value of 3500 @ -25 degree C and a maximum MRV cP of 60,000 @ -30 degrees C. The
    lower the cP value for both specifications, the better.
    Notice that the 0W grade oil is tested at a lower temperature on both tests AND must still have a lower
    CCS cP value than a 5W oil which is tested at a higher temperature. As a result, a 0w30 will allow your
    vehicle to start easier on a cold morning than a 5w30 will. Likewise, a 5w30 oil will pump easier in cold
    temperatures than a 10w30 oil will.
    Nevertheless, at 100 degrees C, they all fall within the same kinematic viscosity range. Therefore, they
    are all classified as SAE 30 weight oils at 100 degrees C. In other words, after your engine has warmed
    up, a 0w30 and 10w30 motor oil are basically the same thickness (within a certain SAE specified
    range).
    Of course, although this is true when the oil comes out of the bottle, we'll see in the next section that,
    with petroleum oils at least, the viscosity that comes out of the bottle may not necessarily be the
    viscosity that you find within your engine after a short period of driving.

    Just food for thought!
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  7. #7
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    5W30= Flows like a 5W protects like a 30W.
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  8. #8
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    I've gotten my oil changed at a dealership since I got my Charger (I have the 3.5L V6). They have always used 5W30, even though the crank case cap has 10W30 printed on it. I haven't had any problems, so I haven't worried about it. But I save all my receipts, so I have proof that the service depts. are using 5W30 if there ever is any problem caused by not using the oil that the manual recommends.

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