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Old 08-20-2012, 11:38 AM
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question about "change oil" indicator

This (2011 Lib) is the first vehicle I've owned that tells me when to change the oil. I bought the vehicle used, and the indicator had gone off about 3000 miles after I bought it. I figured that the dealer hadn't changed the oil when they got it in, since the manual says to change every 8000, but now it just went off again, about 3000 miles/4 months later.

I've heard 2 different things about how this works -
* One is that some sort of sensor can determine how dirty the oil is, and that the oil change interval is based solely on the condition of the oil

* The other is that there is a "counter" that counts down & will go off when you hit either 8000 miles or 6 months since the last oil change/reset.

Since it's going off now, less than 6 months/8000 miles, the only option that seems to make sense is the first. I don't really get this, since I drive primarily highway miles, don't drive in dusty conditions, very rarely tow anything (and if I do, it's a utility trailer with a couple hundred pounds on it). I don't really get it, & don't want to waste my time/money changing it if I don't need to..
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Old 08-20-2012, 05:23 PM
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Re: question about "change oil" indicator

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Originally Posted by jerkylips View Post
This (2011 Lib) is the first vehicle I've owned that tells me when to change the oil. I bought the vehicle used, and the indicator had gone off about 3000 miles after I bought it. I figured that the dealer hadn't changed the oil when they got it in, since the manual says to change every 8000, but now it just went off again, about 3000 miles/4 months later.

I've heard 2 different things about how this works -
* One is that some sort of sensor can determine how dirty the oil is, and that the oil change interval is based solely on the condition of the oil

* The other is that there is a "counter" that counts down & will go off when you hit either 8000 miles or 6 months since the last oil change/reset.

Since it's going off now, less than 6 months/8000 miles, the only option that seems to make sense is the first. I don't really get this, since I drive primarily highway miles, don't drive in dusty conditions, very rarely tow anything (and if I do, it's a utility trailer with a couple hundred pounds on it). I don't really get it, & don't want to waste my time/money changing it if I don't need to..
The KK's RT WK2 and other "new generation" vehicles have the sensor which read your average driving speed, engine oil temp, coolant temp, exterior temp and oil condition to make a determination when its "time for service". You can reset tihs but on most cars it will go off in the 2800-4,000 mile mark. Some higher some lower depending on driving.
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Old 08-20-2012, 08:37 PM
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Thanks for the response. I'm still unsure how this fits in with the 8000 interval in the manual. I'm having a hard time reconciling those two things..
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Old 08-20-2012, 10:16 PM
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Re: question about "change oil" indicator

To go 8k you need different conditions. Your habits and conditions don't allow you to see maximum mileage
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Old 08-21-2012, 08:17 AM
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I'm not sure if I buy that. It was almost EXACTLY 3000 miles since last change when the indicator went off, makes me think that it just counts down miles. I can't seem to find documentation that shows exactly how it works.

I'm not trying to be a d!ck, but I know how I drive, where I drive, etc. There's no reason I can see that my interval has gone down from 8000 to 3000.
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Old 08-21-2012, 09:54 AM
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Re: question about "change oil" indicator

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Originally Posted by jerkylips View Post
I'm not sure if I buy that. It was almost EXACTLY 3000 miles since last change when the indicator went off, makes me think that it just counts down miles. I can't seem to find documentation that shows exactly how it works.

I'm not trying to be a d!ck, but I know how I drive, where I drive, etc. There's no reason I can see that my interval has gone down from 8000 to 3000.
I'm not trying to sell you ,anything, so you don't have to buy anything. I am simply explaining how it works, and how that system was designed. Its not that you dont know how to drive its that your drive cycles (speed temp and distance) dont meet the criteria to have the oil life extended to 8,000 miles. I have yet to see a Hemi, 3.7, 4.7 ect have issues with oil consumption, or even making sludge. Ignore it if you want, just know that you should check the oil level every 1,000 miles AFTER 3000. It wll burn at least a quart after the 3,000 mile marker (again, factory standard).
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Old 08-21-2012, 11:57 AM
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Re: question about "change oil" indicator

was searching for additional info on this topic & came across an old thread from this site. Not sure if this is accurate, but the poster said that he had found documentation that indicated basically there are 2 "duty cycles" that are monitored - normal & severe (which matches with the owners' manual). The onboard computer analyzes at 3000 miles, basically, whether it was a normal or severe cycle - if severe, oil change light comes on at 3000 miles - if normal, then it comes on at 8000. That makes more sense to me than the idea that the car somehow determines that "oil change is required at 5387 miles this time". I don't think my car is that smart.

The only thing that is still getting under my skin is that I can't think of any way that my driving would qualify as "severe" so I'm not sure why I'm being prompted to change at 3k..

EDIT:

I called the dealership just now. First, I got the service advisor, who sounded like Kitty from "That 70's Show". When I asked her, she said, "there's a sensor in there....that measures the oil....for when it needs to be changed". I knew this wasn't correct, so I questioned it further. She responded with, "you mean....a part? that measures it?" She puts the phone down & I hear her asking someone else. She gets back on the phone - "I just asked the service manager. It's the compuuuuuuter. The compuuuter tells you when you need to change it. Just do it when the compuuuter tells you.."

At this point, I'm starting to get fired up. I told her that I realize that, but I want to know how "the compuuuuuter" determines it. "it's based on how you drive". good god. "can I please talk directly to the service manager?"

So she puts him on. I give him the whole story, telling him that what I'm seeing doesn't seem to match up with what i'm reading. It's too coincidental that I'm getting the indicator EXACTLY at 3k - not 2800, not 3200, etc. I asked him if it could work the way I described above, that it determines oil change at either 3000 or 8000. He says, "no, I don't think it works that way". Then he says, "you know, I think I remember seeing a bulletin on something like this". I had my hopes up, but he came back to the phone to say he couldn't find it.

He then says that he thinks I should bring it in to be checked out, and when I do, make sure I tell them that the service manager knows the story & he wants to be involved when they look it over. I'll give him credit for trying, I guess, but I find it very disturbing/unnerving that the service manager at the dealership doesn't know how this function works. But at least I know that "it's the compuuuuuuuuuter"...
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Old 08-21-2012, 12:25 PM
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Re: question about "change oil" indicator

Look in your owners manual, I use to have oen that I would show my customers. to be "normal driving" you need to be between speeds of 20-60, and no constant speed. No driving with a/c or headlight use (extra strain on the battery, thus extra strain on the alt, which is more drag on accessorie drive, which you guessed it ....is more load on the crank shaft). ....... seriously no one drives in "normal" and if you do, then you are a perfect person. I will look again on the web for the page which dictates to you the standard for normal/sever driving.
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Old 08-21-2012, 12:34 PM
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Re: question about "change oil" indicator

this is the 03 schedule a/b listing...

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Old 08-21-2012, 01:04 PM
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Re: question about "change oil" indicator

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Originally Posted by Duff Daddy View Post
this is the 03 schedule a/b listing...

thanks for posting this. Am I reading that this was for a 2003 model? Mine is a 2011. I'm not sure I posted this in the correct forum.. I did look at my manual, but it doesn't have anything this specific - just a generic statement about 'severe use', not defining WHAT that is, and then the maintenance schedule showing oil changes every 8000 miles -there are no alternate/severe schedules.
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Old 08-21-2012, 02:07 PM
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Re: question about "change oil" indicator

2008-2012 models

The Oil Change Indicator system uses the Powertrain Control Module to process a variety of inputs and then decides on an oil change interval. The factors which point toward severe use include the following:

- Ambient temperature inputs which indicate extended periods of low temperature operation
- Average vehicle speeds which indicate stop-and-go driving
- Run time which indicates prolonged idling
- Trip lengths and coolant temperatures which indicate short trips
- Engine RPM and engine loads which indicate trailer tow usage
- Fuel indications of an ethanol percentage of 60 percent or greater

The system cannot keep track of dusty conditions or time elapsed since the last maintenance. In fact, it is possible for the maximum allowable maintenance time interval to elapse without an oil change reminder. In such a case, it is the owner’s responsibility to ensure that maintenance is performed according to the recommended interval.

History

2007 MODEL YEAR AND PRIOR

Separate schedule A (normal) and schedule B (Severe)

2008 MODEL YEAR

New 6 months or 6,000 miles interval maintenance schedule and automatic oil change indicator. Severe condition oil drain interval 6 months or 3,000 miles.

2011 MODEL YEAR

Maintenance schedule revised to 6 months or 8,000 miles (except SRT). Severe condition oil drain interval revised to 6 months or 4,000 miles.

2013 MODEL YEAR – VARIABLE OIL CHANGE INTERVAL

Maintenance schedule revised to 12 months or 10,000 miles (Except SRT models and Diesel engines). Fully variable metrage algorithm based automatic oil change indicator system. Improves customer satisfaction and reduces environmental impact. Monitors driving habits, hardware differences and environmental conditions continuously compared to the previous system that did not adjust the oil drain interval beyond 3,500 miles. Supports, "Percent Oil Life Remaining" dash display along with the "Change Oil Soon" and "Change Oil Now" dash display features.


More info: http://www.wk2jeeps.com/wk2_oil_indicator.htm

--Milous
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Old 08-21-2012, 03:20 PM
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Re: question about "change oil" indicator

^ pretty much what I said prior. I said it was an 02/3 for refrence for what cdj uses as far as normal/severe driving conditions.....
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