Oil Life Monitor/indicator/sensor

[Jozuah]

SOOOO here we are again.
after getting my new tuned PCM and doing the loner program i thought , what a GREAT time to test the OLM system in my trailblazer.
i received the loaner PCM from the tuners (PCMforLESS) and installed it, taking note of the oil life left on the oil i had in it.
the OLM said 12% left and i had gone 7,268.4 miles since the last change. after 4 days i received my tuned PCM back and installed it. the OLM said 12% oil life left still after ~400 miles. since the PCM was not in the vehicle and i had recorded the percentage left of the oil i RESET the oil life system. said 100% oil life left. This can be proven with OnStar's vehicle diagnostic report to my email if needed.
Now its been 2 weeks and i have recorded 1,221.9 miles and the oil life system tells me i have 44% oil life left. hmmmmmmmm, lets do some math, BAH ! no need, just look at the numbers.

the OLM system MUST know the state of the oil in your crank case by oil pressure readings at cold start and sink times, if not then why the WAY rapid drop in oil life when i have changed NOTHING about the way i drive or the routes.

please enlighten me oh great one of copy and paste. ask some "i have a ton of time to post on the internet that i was instrumental in creating the GM OLM system" engineer what his thoughts are on the subject.

and YES!!! im picing a fight,, round 1 DING!!!:weird:

[Stan]

You did not state if your vehicle is equipped with the optional Trunk Monkey RPO- ZO62. www.trunkmonkey.com. I have this option and I know (from reading the owners manual) each night the Trunk Monkey exits my vehicle, raises the hood, checks the oil level and then does a complete analysis of the engine oil. This data is then entered into the PCM for later driver reference.

In your case, assuming you have this option ZO62, the TM is aware of your non-factory modifications to the vehicle, he therefore simply modifies all readings using a complicated calculation developed by GM engineers.

Don’t worry about this situation, it is considered normal and should not be causing any driver concern. Everything is as exactly as designed. Rather, I would work on spelling skills whereas “picing” should actually be spelled as “picking”

[ehall0527]

You did not state if your vehicle is equipped with the optional Trunk Monkey RPO- ZO62. www.trunkmonkey.com (http://www.trunkmonkey.com). I have this option and I know (from reading the owners manual) each night the Trunk Monkey exits my vehicle, raises the hood, checks the oil level and then does a complete analysis of the engine oil. This data is then entered into the PCM for later driver reference.

In your case, assuming you have this option ZO62, the TM is aware of your non-factory modifications to the vehicle, he therefore simply modifies all readings using a complicated calculation developed by GM engineers.

Don’t worry about this situation, it is considered normal and should not be causing any driver concern. Everything is as exactly as designed. Rather, I would work on spelling skills whereas “picing” should actually be spelled as “picking”

:rotfl:

[MTPockets]

Josh as far as I know, the OLM system on our GMT360's is all software based, using only temperature, time and engine revolution count inputs. AFAIK, it doesn't read levels or pressures. It's either that or the trunk monkey automatic sampling system.

Joel

[Jozuah]

You did not state if your vehicle is equipped with the optional Trunk Monkey RPO- ZO62. www.trunkmonkey.com. I have this option and I know (from reading the owners manual) each night the Trunk Monkey exits my vehicle, raises the hood, checks the oil level and then does a complete analysis of the engine oil. This data is then entered into the PCM for later driver reference.

In your case, assuming you have this option ZO62, the TM is aware of your non-factory modifications to the vehicle, he therefore simply modifies all readings using a complicated calculation developed by GM engineers.

Don’t worry about this situation, it is considered normal and should not be causing any driver concern. Everything is as exactly as designed. Rather, I would work on spelling skills whereas “picing” should actually be spelled as “picking”
what eh toattal waist uf yours time huh..

[ylab]

Any chance that PCM4Less alters the OLM settings to reflect a 3k oil change interval? - Just a thought, I've swapped PCMs back to stock for about a month early last year to have Lyndon make an change or two and recorded the numbers and didn't experience anything like that. My OLM just gradually decreased as it always did and in fact I knew to deduct 14% off of the number once the original core came back and was reinstalled to get the real number. (It was swapped for a total of 14%).

[Jozuah]

Josh as far as I know, the OLM system on our GMT360's is all software based, using only temperature, time and engine revolution count inputs. AFAIK, it doesn't read levels or pressures. It's either that or the trunk monkey automatic sampling system.

Joel

i completely agree Joel.
after talking at length with a GM master tech in a dealership in my local town here (as you'll see there is only one) it does monitor oil pressure and variables related to temperature that add to the algorithm's decision to modify the oil time remaining. oil has less viscosity as it gains HC's from blow by and other factors.

he also explained how its possible to park a car for a undetermined length of time and the OLM will recognize that the oil has been compromised.

nifty stuff.
josh

[Jozuah]

Any chance that PCM4Less alters the OLM settings to reflect a 3k oil change interval? - Just a thought, I've swapped PCMs back to stock for about a month early last year to have Lyndon make an change or two and recorded the numbers and didn't experience anything like that. My OLM just gradually decreased as it always did and in fact I knew to deduct 14% off of the number once the original core came back and was reinstalled to get the real number. (It was swapped for a total of 14%).

were you running mobil 1 or ams oil ?

[MTPockets]

..after talking at length with a GM master tech in a dealership in my local town here (as you'll see there is only one) it does monitor oil pressure and variables related to temperature that add to the algorithm's decision to modify the oil time remaining..

Wow, it is a pretty dynamic system then!:eek: Good to know.

Joel

[Super 88]

i completely agree Joel.
after talking at length with a GM master tech in a dealership in my local town here (as you'll see there is only one) it does monitor oil pressure and variables related to temperature that add to the algorithm's decision to modify the oil time remaining. oil has less viscosity as it gains HC's from blow by and other factors.

he also explained how its possible to park a car for a undetermined length of time and the OLM will recognize that the oil has been compromised.

nifty stuff.
josh

If that's true about the oil pressure, why do you have to reset it when you change oil? If it is indeed monitoring oil pressure, when you change your oil with 7 quarts of new stuff, the oil pressure should go UP, therefore the OLS should change your percentage of life from say 20 percent to 100 percent!
Also GM states in the owners manual - if the light does NOT come on in one year to change the oil and reset the system. If the car sat "for a undetermined length of time" the OLS should know this and turn the light on or lower the percentage!

[Jozuah]

If that's true about the oil pressure, why do you have to reset it when you change oil? If it is indeed monitoring oil pressure, when you change your oil with 7 quarts of new stuff, the oil pressure should go UP, therefore the OLS should change your percentage of life from say 20 percent to 100 percent!
Also GM states in the owners manual - if the light does NOT come on in one year to change the oil and reset the system. If the car sat "for a undetermined length of time" the OLS should know this and turn the light on or lower the percentage!


THERE YOU ARE.......
comment on what i said , dont change the subject.

"IF" thats true?.... shouldn't you be able to cut and paste something from GM worldwide to back you up.. these are FACTS not guesses or copy and paste.
seems i have provided you with the facts you asked for, and now we start talking about a reverse algorithm.. further proving my goal.
DING DING round 2:raspberry

[2002SLT]

If that's true about the oil pressure, why do you have to reset it when you change oil? If it is indeed monitoring oil pressure, when you change your oil with 7 quarts of new stuff, the oil pressure should go UP, therefore the OLS should change your percentage of life from say 20 percent to 100 percent!

:iagree: Bingo! It's clueless.

[Jozuah]

:iagree: Bingo! It's clueless.

HAHAHH ! !! !

[Super 88]

THERE YOU ARE.......
comment on what i said , dont change the subject.

"IF" thats true?.... shouldn't you be able to cut and paste something from GM worldwide to back you up.. these are FACTS not guesses or copy and paste.
seems i have provided you with the facts you asked for, and now we start talking about a reverse algorithm.. further proving my goal.
DING DING round 2:raspberry

Uh Jozuah, what "facts" are you talking about? The ones where some "GM master tech in a dealership in my local town here" spouts some nonsense? Those aren't facts, that is at best hear-say.

I used simple logic to see if your "facts" would hold up! Obviously they don't.
I could give you hundreds of links to how this thing works, but instead why don't you go to google and get them yourself?

[2002SLT]

HAHAHH ! !! !

At least I'm not the one taking the word of a GM "Master Tech" as the gospel. :crazy:

You need to put some logic to this and not just believe everything you hear. :thumbsup:

[Jozuah]

okies i have...

The GM solution is for motorists to depend on its patented Oil Life System (OLS). The owner's manuals in today's GM fleet no longer make specific mileage recommendations. Instead, the GM Oil Life System analyzes the engine's operational data including but not limited to temperature, revolutions, speed, to calculate the rate of engine oil degradation and determine when an oil is nearing the end of its life. At this point a message on the dashboard signals that it is time to change oil.

Each OLS computer model is engine-specific because GM believes each engine behaves differently under the various driving situations and conditions. For this reason ]GM is on record as stating there can be no standard oil change interval. Both cars and driving styles vary. The OLS allegedly calculates all factors pertaining to the engine and the driver and thereby makes its oil change recommendations.

GM senior project engineer Robert Stockwell has been studying analyzed oil samples from vehicles with OLS.

[2002SLT]

What's your point? We know there are algorithms that calculate this to the best of their ability. My problem was with your statement that if you reset the monitor to 100% it was able to tell you had old oil.

[Jozuah]

What's your point? We know there are algorithms that calculate this to the best of their ability. My problem was with your statement that if you reset the monitor to 100% it was able to tell you had old oil.

I never said that, and after re-reading what i posted, i really dont know how that could have been misunderstood.
My entire point is to say the GM oil life system is VERY VERY "dynamic" (as joel put it) and CAN tell if other factors have influenced the integrity of the oil itself, all this by NEVER actually testing the oil itself.
so if you poor water in your crank case and it goes all milky like a head gasket out , you'll get 14K miles out of the oil as you did before ,, answer is NO WAY NO HOW.
this entire thing started when mr.88 posted some BTOG copy and paste then became the on-site master of the gm oil life system after quoting some guy claiming to be an engineer. people who copy and paste then claim it as their own, are lower than the sludge in the oil that we are talking about.
common sense ALONE would tell you that GM would never use a system that if filled with marvel's mystery oil (which under no load would last about 2 hours and 26 mins before it failed and welded the crank to the journals in a fresh 350 CID V-8-- more facts--.) would check oil life on revolutions speed and heat alone and then tell their customers to "trust" it.
he asked me for facts , and i got them , from GM Via a 30 year master tech, albeit in my lil ol utah home town but he also knew what a CASE relearn was without leading the wittiness.
peace

[Super 88]

I never said that, and after re-reading what i posted, i really dont know how that could have been misunderstood.
My entire point is to say the GM oil life system is VERY VERY "dynamic" (as joel put it) and CAN tell if other factors have influenced the integrity of the oil itself, all this by NEVER actually testing the oil itself.
so if you poor water in your crank case and it goes all milky like a head gasket out , you'll get 14K miles out of the oil as you did before ,, answer is NO WAY NO HOW.

Where is your proof? This is opinion! Namely yours!

this entire thing started when mr.88 posted some BTOG copy and paste then became the on-site master of the gm oil life system after quoting some guy claiming to be an engineer. people who copy and paste then claim it as their own, are lower than the sludge in the oil that we are talking about.
common sense ALONE would tell you that GM would never use a system that if filled with marvel's mystery oil (which under no load would last about 2 hours and 26 mins before it failed and welded the crank to the journals in a fresh 350 CID V-8-- more facts--.) would check oil life on revolutions speed and heat alone and then tell their customers to "trust" it.
he asked me for facts , and i got them , from GM Via a 30 year master tech, albeit in my lil ol utah home town but he also knew what a CASE relearn was without leading the wittiness.
peace
Like I said opinion. As a matter of fact you state the exact reason some people believe you should NOT trust the OLS is IF you do get anti-freeze or "marvel's mystery oil" in your engine the OLS would not know it and you would destroy your engine.

okies i have...

The GM solution is for motorists to depend on its patented Oil Life System (OLS). The owner's manuals in today's GM fleet no longer make specific mileage recommendations. Instead, the GM Oil Life System analyzes the engine's operational data including but not limited to temperature, revolutions, speed, to calculate the rate of engine oil degradation and determine when an oil is nearing the end of its life. At this point a message on the dashboard signals that it is time to change oil.

Each OLS computer model is engine-specific because GM believes each engine behaves differently under the various driving situations and conditions. For this reason ]GM is on record as stating there can be no standard oil change interval. Both cars and driving styles vary. The OLS allegedly calculates all factors pertaining to the engine and the driver and thereby makes its oil change recommendations.
Where does it say oil pressure or oil condition. I see temperature (as in engine coolant temperature, revolutions, speed, but no mention of oil condition or pressure. Hmmmm.

GM senior project engineer Robert Stockwell has been studying analyzed oil samples from vehicles with OLS.

Umm, yeah so? Are you quoting him or what?

Josh as far as I know, the OLM system on our GMT360's is all software based, using only temperature, time and engine revolution count inputs. AFAIK, it doesn't read levels or pressures. It's either that or the trunk monkey automatic sampling system.


Joel
:iagree:

You did not state if your vehicle is equipped with the optional Trunk Monkey RPO- ZO62. www.trunkmonkey.com. I have this option and I know (from reading the owners manual) each night the Trunk Monkey exits my vehicle, raises the hood, checks the oil level and then does a complete analysis of the engine oil. This data is then entered into the PCM for later driver reference.

In your case, assuming you have this option ZO62, the TM is aware of your non-factory modifications to the vehicle, he therefore simply modifies all readings using a complicated calculation developed by GM engineers.

Don’t worry about this situation, it is considered normal and should not be causing any driver concern. Everything is as exactly as designed. Rather, I would work on spelling skills whereas “picing” should actually be spelled as “picking”

:thumbsup: :dielaugh: :dielaugh: :dielaugh:

[Gearhead2012]

Ok...not to intrude here on ya'lls little parade or anything, but, how would one go about checking oil life left? I've got an 03, LS, without the compass, and overhead storage bins and all that stuff. Is there a way to check the oil's % left...via the dash (where the odometer is and all)? Thanks.

[Jozuah]

before it gets closed,

if you have the DIC you can scroll through the button with the gas pump and it says oil life left. if not , no clue but the light will tell you ..

hi ghoster :hissy:

[Stan]

I completely agree with Jozuah. Case in point… My GM approved Trunk Monkey came with the factory fill of trunk monkey food. At 4,279 miles my dash indicated “Feed Trunk Monkey”. Rather than follow GM’s recommendations, I switched to a full synthetic Trunk Monkey Food. Within a day I got another message “Service Trunk Monkey”. I have never serviced a Trunk Monkey and decided to wait for the Master Technician to handle this task. What a disaster, still cleaning up the mess :cry: when the Trunk Monkey (without warning) blew his rear end. I was told that the system did sense the pressure build up within the Trunk monkey's internal systems and that caused the warning to appear.

[Jozuah]

I completely agree with Jozuah. Case in point… My GM approved Trunk Monkey came with the factory fill of trunk monkey food. At 4,279 miles my dash indicated “Feed Trunk Monkey”. Rather than follow GM’s recommendations, I switched to a full synthetic Trunk Monkey Food. Within a day I got another message “Service Trunk Monkey”. I have never serviced a Trunk Monkey and decided to wait for the Master Technician to handle this task. What a disaster, still cleaning up the mess :cry: when the Trunk Monkey (without warning) blew his rear end. I was told that the system did sense the pressure build up within the Trunk monkey's internal systems and that caused the warning to appear.
you are a waste of skin

do you call yourself "Stan the man" and point your thumbs at yourself ? LMAO!!

[Stan]

It’s OK Jozuah. Just trying to add a little humor to the board and have a little fun. No harm, no foul. I apologize if my words have upset you. I write comedy for a living and sometimes I just can’t resist. I’ll try and be more serious in the future.
Stan "The Man"

[ghoster]

This thread is not about discussing how the OLS sytem operates, it has degraded into an insult match. It is now closed.