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Oil Monitor
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Frank3
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PostPosted: Tue Oct 11, 2011 6:11 pm    Post subject:  Oil Monitor Reply with quote

While I don't use the oil monitor to tell me when to change my oil, I've noticed that the Change Oil reminder is not going off in my Impala. I had the BCM replaced some time ago due to an error that was occurring when locking the car with the remote. Does the oil monitor reside in the BCM or the PCM and is it possible to read with a scan tool what the oil monitor thinks the oil monitor life is? I thought it was some sort of counter that counted crank revolutions and just decremented down to zero when it was time to change the oil.
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PostPosted: Tue Oct 11, 2011 6:19 pm    Post subject:   Reply with quote

I don't know where is is actually being calculated, but I can tell you I've seen mine less than half a dozen times in 125k miles in my Monte Carlo.

As far as the algorithm, it's supposedly more complex than a simple countdown timer, but I don't trust it at all.

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PostPosted: Tue Oct 11, 2011 8:23 pm    Post subject:   Reply with quote

Your Oil Moniter takes into account the "slipperiness" of your oil. The dirtier it is, the less slippery, eventually getting to the point where your oil moniter decides that your oil isn't sufficient enough to properly lubricate your engine, tripping the "Change Engine Oil" light in your car. I think it also sets off at 7500 miles since it was last reset, if the oil is still slippery enough for your moniter to not be tripped. I always reset the engine oil moniter after every oil change (yes, you can reset it, even if it isn't tripped). That way, I know whether or not it was set off by mileage, or the condition of my oil.
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PostPosted: Tue Oct 11, 2011 8:29 pm    Post subject:   Reply with quote

Just out of curiosity, how does the car know how 'slippery' your oil is?

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PostPosted: Tue Oct 11, 2011 8:32 pm    Post subject:   Reply with quote

jmakinen wrote:
Your Oil Moniter takes into account the "slipperiness" of your oil. The dirtier it is, the less slippery, eventually getting to the point where your oil moniter decides that your oil isn't sufficient enough to properly lubricate your engine, tripping the "Change Engine Oil" light in your car. I think it also sets off at 7500 miles since it was last reset, if the oil is still slippery enough for your moniter to not be tripped. I always reset the engine oil moniter after every oil change (yes, you can reset it, even if it isn't tripped). That way, I know whether or not it was set off by mileage, or the condition of my oil.


How does it take into account the "slipperiness" of the oil? There's no sensor that monitors the viscosity or lubricity of the oil. Sounds like BS to me.

For real info on the OLM, visit this link:

http://assets.cobaltnitra.com/.....fa6b30.pdf

bbengineer wrote:
Just out of curiosity, how does the car know how 'slippery' your oil is?

BBEngineer


I think your BS indicator light just went off.

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PostPosted: Tue Oct 11, 2011 8:43 pm    Post subject:   Reply with quote

bbengineer wrote:
Just out of curiosity, how does the car know how 'slippery' your oil is?

BBEngineer


I can't find the article right now, but found a better one instead.

http://assets.cobaltnitra.com/.....fa6b30.pdf

And this one-

http://www.gm-trucks.com/forum.....pic=116885

Guess it doesn't really base it on slipperiness, but instead on pretty much everything else. But that's basically what happens to oil when it deteriorates, it gets less slippery. The more slippery the oil, the less friction, and therefore the more efficient the engine runs, with less wear.

EDIT: Damnit WhiteLightning, ya beat me to one of them. And ya don't gotta be an @$$ your whole life...
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PostPosted: Tue Oct 11, 2011 8:50 pm    Post subject:   Reply with quote

Here's the description right from the owner's manual

Quote:
When to Change Engine Oil (GM Oil Life System)

Your vehicle has a computer system that lets you know when to change the engine oil and filter. This is based on engine revolutions and engine temperature, and not on mileage. Based on driving conditions, the mileage at which an oil change will be indicated can vary considerably. For the oil life system to work properly, you must reset the system every time the oil is changed.

When the system has calculated that oil life has been diminished, it will indicate that an oil change is necessary. A CHANGE ENGINE OIL message will come on. Change your oil as soon as possible within the next two times you stop for fuel. It is possible that, if you are driving under the best conditions, the oil life system may not indicate that an oil change is necessary for over a year. However, your engine oil and filter must be changed at least once a year and at this time the system must be reset. Your dealer has GM-trained service people who will perform this work using genuine GM parts and reset the system. It is also important to check your oil regularly and keep it at the proper level.

If the system is ever reset accidentally, you must change your oil at 3,000 miles (5 000 km) since your last oil change. Remember to reset the oil life system whenever the oil is changed.


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PostPosted: Tue Oct 11, 2011 9:45 pm    Post subject:   Reply with quote

Thanks for all the info on the OLM. While reading it I was reminded of an article I read years ago about the other factors that go into the monitor. Is there a way to read what the OLM states what % of oil life is remaining with a scanner or possibly through setting some buttons on the radio as my fathers chevy equinox can do or my olds aurora used to do?
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PostPosted: Tue Oct 11, 2011 10:43 pm    Post subject:   Reply with quote

not that Im aware of, I would completely ignore the OLM and just change the oil at regular intervals. I had my SS for 4 years and only seen the light once.

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primet
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PostPosted: Wed Oct 12, 2011 2:40 am    Post subject:  oil changes Reply with quote

worked in a school bus yard in Las Vegas For 7 years (from where I finally retired in 2010) and our yard also took care of PM's on a white fleet of approx 300 cars and trucks that were 95% late model Chev.

The PM schedules varied with oil and filter every 3000 miles and the change oil light ignored (but reset at every service).

With the recession and lack of state money in NV our bosses decided to do a oil study on both the buses and white fleet having us take oil samples at every service which was sent in for analysis..metal content, break down of additives the works. Well to make a long story short at 3000 miles the oil was as new, and at 6000 miles oil breakdown was less than 18%.

All PM's were changed to 6000 mile intervals and could probably have gone to 10000 but the old school thinking that has been beaten into our heads for the last 50 years scared them off. Facts are most oils these days are alot different then the oils we grew up with, better engineered and refined and the engines in our cars and trucks are made with better alloys and designs making them more efficient and clean burning.

I changed my oil to Mobile 1 mainly because all the high dollar GM products use it and I figured it as a little insurance for my LS4. Facts are it probably makes no difference (I kinda know this in my heart) but it makes me feel good and I don't change my oil until my oil minder gets to 10% (about every 4800 to 5500 miles)

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PostPosted: Wed Oct 12, 2011 2:49 am    Post subject:  Re: oil changes Reply with quote

primet wrote:
worked in a school bus yard in Las Vegas For 7 years (from where I finally retired in 2010) and our yard also took care of PM's on a white fleet of approx 300 cars and trucks that were 95% late model Chev.

The PM schedules varied with oil and filter every 3000 miles and the change oil light ignored (but reset at every service).

With the recession and lack of state money in NV our bosses decided to do a oil study on both the buses and white fleet having us take oil samples at every service which was sent in for analysis..metal content, break down of additives the works. Well to make a long story short at 3000 miles the oil was as new, and at 6000 miles oil breakdown was less than 18%.

All PM's were changed to 6000 mile intervals and could probably have gone to 10000 but the old school thinking that has been beaten into our heads for the last 50 years scared them off. Facts are most oils these days are alot different then the oils we grew up with, better engineered and refined and the engines in our cars and trucks are made with better alloys and designs making them more efficient and clean burning.

I changed my oil to Mobile 1 mainly because all the high dollar GM products use it and I figured it as a little insurance for my LS4. Facts are it probably makes no difference (I kinda know this in my heart) but it makes me feel good and I don't change my oil until my oil minder gets to 10% (about every 4800 to 5500 miles)

PT


Interesting facts. Where the fleet vehicles driven hard? I still change mine between 3 and 5K. Have gone up to 18,000 before...

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PostPosted: Wed Oct 12, 2011 3:21 am    Post subject:  oil Reply with quote

Man Las Vegas gets HOT and dusty, and we've had to lock out the gas cards of some who "never" had the time to come in for service. Like all fleets the units get beat on but when it's time to BER them it's almost never for engine failure.

It was amazing to pull dip sticks in the auction yard where the old units get sold and the oil would be clean and clear at 125k miles. It was really a shame to see the waste as good running high mileage units were bought up by Hispanic Gentleman for pennys, taken south and beat for another 100k. Seems no matter how tight state money gets the big wigs can't be seen in a 5 year old car.

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PostPosted: Wed Oct 12, 2011 1:23 pm    Post subject:   Reply with quote

Yes, newer oils CAN last up to 15K and still protect engines. However, every engine wears differently and some may have other issues. The only tried and true way to judge your oil change interval, is to send a clean sample and a used sample to a testing facility. They can test each aspect of it and tell you how you engine is wearing and how long you should run your oil of choice.

http://www.blackstone-labs.com/

And to elaborate for those who didnt click the links,....

From my GM training, the older oil life monitors, such as in the 2000-2005 Impala's, basically only monitor engine revolutions, engine temperature and ambiant temperature. It does use a countdown system, but each engine revolution is calculated differetly depending on the above variables.

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PostPosted: Wed Oct 12, 2011 3:44 pm    Post subject:   Reply with quote

on the SS I used Mobil1 and changed it once a year (about 7500 miles) On the Chrysler I run regular oil and change every 5000 miles (again, about once a year)

The Monte gets regular oil with ZDDP additive for the flat tappet cam, changed once a year (about every 1000 miles)

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PostPosted: Fri Nov 18, 2011 11:29 pm    Post subject:   Reply with quote

I know every engine and everyone's driving habits are different, but does 10000 miles like too much for Mobil1 in the Impala? A friend of mine was having problems with his Impala and was changing oil according to the monitor. He started having problems with the motor getting all "gummed" and "gunked" up in the valve train and was even having oil drain-back problems with his 3.8L
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