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Old 02-25-2017, 04:27 PM   #1
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Default Oil change light

I purchased a 30th Anniversary TA about 2000 miles ago. I changed the oil soon after I got it. Mobil 1 5w-30. I had an oil change light this morning. Is this something that is triggered by mileage or is it sensing filter restriction or some other issue? If it is just a mileage trigger, how do I reset it?
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Old 02-25-2017, 06:12 PM   #2
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Not sure how it works but you reset it by holding the trip reset button in for something like 13 seconds and youll see the light flash and disappear.
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Old 02-25-2017, 06:27 PM   #3
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OK, cool. Thanks. I just tried that. Oil change light was steady, then flashing, then gone.
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Old 02-25-2017, 11:23 PM   #4
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Yep thats it
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Old 02-26-2017, 01:20 PM   #5
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You can also turn the key to the "ON" position, then press the accelerator pedal to the floor 3 times within 5 seconds of each other. That will also turn the light off.
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Old 02-26-2017, 02:04 PM   #6
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I'll try that next time. Thanks.
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Old 02-28-2017, 09:14 PM   #7
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It's more than just a mileage counter. It contains sophisticated algorithms that factor in starting temps, operating temps, engine revs and other parameters to determine oil life. I've had it come on at under 3000 miles in winter and close to 5000 miles in summer. Since you likely didn't reset it when you changed the oil, it's calculating off the last reset by the previous owner.
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Old 03-01-2017, 08:01 PM   #8
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98's don't have this feature, or a low fuel light. Yippie!
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Old 03-02-2017, 09:09 PM   #9
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Mine usually stays off for like 7,000 miles.

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Originally Posted by chrysler kid View Post
98's don't have this feature, or a low fuel light. Yippie!
None of them technically have a "low fuel" light, only that the check gauges light illuminates when you have like 1/8th of a tank or less.
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Old 03-03-2017, 08:27 AM   #10
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I hate the "Check Guages" light triggered by low fuel. My other 2 Gen 4's didn't have that feature. And I don't need to be told when to change oil. My MB wagon won't trigger for 13,000 or 14,000 miles. Way too long IMHO.
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Old 03-03-2017, 09:49 PM   #11
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98's don't have this feature, or a low fuel light. Yippie!
98s also have a working temperature gauge, unlike the "dummy" gauges of 99-02
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Old 03-04-2017, 08:52 AM   #12
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Originally Posted by blue09rocket View Post
98s also have a working temperature gauge, unlike the "dummy" gauges of 99-02
Isn't the same thing true of the oil psi gauge?
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Old 03-04-2017, 09:11 PM   #13
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On my '99 I'm not so sure there's an any algo at work other than counting miles. It seems to come in around every 3,000 miles. Since I change it the oil annually by 1400 miles, it's of no use to me. Owner's manual doesn't mention anything about variations in OCI's. When I searched the internet for information on my '99, nothing I found suggested it was anything but a mileage counter. The sophisticated oil algo's of today actually do something.

If the OP just had their oil change light come on after approx 2,000 miles, that's not very good. And decent conventional SN oil should be giving you 4K miles or more....unless you short tripping your car to death. And even then, you should get past 2,000 miles with ease. And Mobil 1 5w-30 SN should be good for 6K-10K miles under normal usage. My car never sees a short trip of under 14 miles with most around 16-25 miles. I drive it to fully warm, never idle for more than a couple minutes, and it rarely sees winter temps when driven. Yet my oil counter has reset twice in under 6,000 miles. Makes no sense for anything but the most unsophisticated "timer."

Even using the API SJ/SL oil specs the 1998-2002 cars originally came with, I can't see 2,000-3,000 mile oil changes when you're not seriously short tripping the car. This early GM oil monitor block diagram only considers Oil Temp and RPMs. Not sure if all 1999 vehicles got it. Some certainly did.

http://media.noria.com/sites/archive...aphics_GM3.gif

Last edited by Firebrian; 03-04-2017 at 09:29 PM.
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Old 03-05-2017, 05:48 AM   #14
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On my '99 I'm not so sure there's an any algo at work other than counting miles. It seems to come in around every 3,000 miles. Since I change it the oil annually by 1400 miles, it's of no use to me. Owner's manual doesn't mention anything about variations in OCI's. When I searched the internet for information on my '99, nothing I found suggested it was anything but a mileage counter. The sophisticated oil algo's of today actually do something.

If the OP just had their oil change light come on after approx 2,000 miles, that's not very good. And decent conventional SN oil should be giving you 4K miles or more....unless you short tripping your car to death. And even then, you should get past 2,000 miles with ease. And Mobil 1 5w-30 SN should be good for 6K-10K miles under normal usage. My car never sees a short trip of under 14 miles with most around 16-25 miles. I drive it to fully warm, never idle for more than a couple minutes, and it rarely sees winter temps when driven. Yet my oil counter has reset twice in under 6,000 miles. Makes no sense for anything but the most unsophisticated "timer."

Even using the API SJ/SL oil specs the 1998-2002 cars originally came with, I can't see 2,000-3,000 mile oil changes when you're not seriously short tripping the car. This early GM oil monitor block diagram only considers Oil Temp and RPMs. Not sure if all 1999 vehicles got it. Some certainly did.

http://media.noria.com/sites/archive...aphics_GM3.gif
On the contrary, In my former 01 Z28 and my current 99 Z28 I've gone as long as 7k intervals on synthetic before seeing it come on and honestly change the oil very sparingly, Like twice maybe three times a year, running full synthetic... never had a single problem, over 200k miles too.
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Old 03-05-2017, 01:43 PM   #15
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Originally Posted by SlasherVRGR View Post
Isn't the same thing true of the oil psi gauge?
No, it's only the coolant temp gauge and sender that changed in '99+ to being more of a dummy gauge in the temp range of ~185-230F. Functionality of all other gauges was not affected or changed.

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...and honestly change the oil very sparingly, Like twice maybe three times a year, running full synthetic...
Frankly I wouldn't consider that sparingly at all. I can't think of many scenarios where someone would actually need to change a good synthetic oil more often than 2-3 times per year. That's about the maximum that should ever be needed.
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Old 03-05-2017, 02:03 PM   #16
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Quote:
Originally Posted by Firebrian View Post
On my '99 I'm not so sure there's an any algo at work other than counting miles. It seems to come in around every 3,000 miles. Since I change it the oil annually by 1400 miles, it's of no use to me. Owner's manual doesn't mention anything about variations in OCI's. When I searched the internet for information on my '99, nothing I found suggested it was anything but a mileage counter. The sophisticated oil algo's of today actually do something.
I don't know about year to year variations, and I would think it likely got more sophisticated with each new OS. But I did read an article about the system online some years ago. The engineer that developed it was a woman, and she described the various parameters that it monitors and the algorithms that integrate them in detail. It's definitely more than a mileage counter.

As I mentioned above and Need4 corroborates or his 99, the interval on my 2000 varies depending on usage.
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Old 03-06-2017, 12:52 AM   #17
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The engineer that developed it was a woman, and she described the various parameters that it monitors and the algorithms that integrate them in detail. It's definitely more than a mileage counter.

As I mentioned above and Need4 corroborates or his 99, the interval on my 2000 varies depending on usage.
That's why I posted that block diagram above showing RPM's and Oil Temp. That's probably an early version circa 1999. It can't be any more complicated than that in my '99. So it's RPM (ie similar to miles) and just oil temp. Very simple and nothing like today's detailed algo's with a half dozen or more inputs.

I don't do extended highway driving so the OLM thinks that my 15-25 mile drives around town during spring/summer/fall at an average of 2000 rpm is severe service. That's fine. I change it annually with 1000-1400 miles where the oil is still probably quite fresh.
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Old 03-06-2017, 06:38 AM   #18
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It's more than temp and RPM. I was alive in 1999 and can testify that we were more civilized than that. We were definitely walking upright, making fire, and using utensils by that time!

Here's a circa 1999 article that gives more details, has links go graphs, etc. http://machinerylubrication.com/Read...-of-oil-change


For $27, this paper should give you the actual concrete details: http://papers.sae.org/870403/
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Old 03-08-2017, 07:28 PM   #19
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It's more than temp and RPM. I was alive in 1999 and can testify that we were more civilized than that. We were definitely walking upright, making fire, and using utensils by that time!

Here's a circa 1999 article that gives more details, has links go graphs, etc. http://machinerylubrication.com/Read...-of-oil-change


For $27, this paper should give you the actual concrete details: http://papers.sae.org/870403/
You are aware that the uncivilized RPM/Temp model I mentioned earlier in this thread and posted with a link...was from this exact same 1999 technical article you linked above (see "figure 3" link in that article). I read that article and several others in the past week before concluding the OLM on my '99 was probably inputted with just RPM/Temp. That doesn't negate the fact that those inputs no doubt model very detailed graphs and studies that were done on actual oil. But, in the end, I don't see anything other than RPM/Temp and some penalty factors that pull from the "bank."

I drive my 1999 SS about 15-25 miles per trip, 50X per year. I've received 2 oil service lights over 6,000 miles so far. iI reset them when they come. I actually change the oil annually with probably tons of TBN left. Last year I researched the current and future OLM systems to see how sophisticated they had become. I posted my findings on Bitog on what one author felt was the ideal system. Maybe time to go back and refresh myself on that model. My 1998 Z28 (owned from 2001-2009) I don't think had an OLM. At least I don't recall following oil changes other than by every 3,000 miles no matter what.

I agree with standing upright and making fire in 1999. Not so sure about "using utensils" though.

Last edited by Firebrian; 03-08-2017 at 07:36 PM.
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Old 03-08-2017, 09:41 PM   #20
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Quote:
Originally Posted by Firebrian View Post
You are aware that the uncivilized RPM/Temp model I mentioned earlier in this thread and posted with a link...was from this exact same 1999 technical article you linked above (see "figure 3" link in that article).
Sorry, I missed that, but I did read the article differently. It references the diagram you linked as a "general" model and also references plural penalty factors - so I am figuring there is more than revolutions and temperature. But those definitely do seem to be dominant factors in the equations.

They talk about a concept of "load", which is something I'm left wanting to understand more. I would think RPM (the speed of the revolutions) must have some bearing in that, even if the revolutions have a greater bearing on the load than their numbers over time.


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I agree with standing upright and making fire in 1999. Not so sure about "using utensils" though.
Call me a pioneer! lol
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