OLM system... Do you trust it and what about synthetics? - Page 5 - Chevy Traverse Forum: Chevrolet Traverse Forum
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post #41 of 54 (permalink) Old 07-15-2019, 08:12 PM
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IMHO - OLM is really there for the little old lady (and a LOT of other people who should know better, but don't) who hasn't got a clue about vehicle maintenance.

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post #42 of 54 (permalink) Old 07-16-2019, 06:25 AM
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Originally Posted by greentraverse View Post
IMHO - OLM is really there for the little old lady (and a LOT of other people who should know better, but don't) who hasn't got a clue about vehicle maintenance.

02.



I agree, but more than that it is a deceiver. It projects the impression that it is scientifically monitoring vehicle health and maintenance systems just like the OBDII system when in fact unlike the OBDII it is not providing a conclusion directly from signals from individual engine and body sensors, only indirectly passively monitoring all signals, relevant or not, fed to the ECU "divining" a conclusion. Worse than that the conclusion can be faulty because it is based on partial data, lacking sensor feedback in critical areas and making assumptions that the correct oil, filters and service parts were substituted or whether they were even replaced when the OLM was reset.



The OLM is no better than (and no more accurate than) the mechanical system in my sister's old Honda running off the odometer with green, yellow, and red flags in the speedometer pod for maintenance items. Green turned to yellow as the recommended mileages in the owners manual approached and turned red when they were reached. At least the driver knew that the system was exactly what it purported to be.

Current Chevys -'19 Silverado RST;'18 Malibu LT Redline;'18 Traverse Premier Redline<br /><br />Previous&nbsp; Chevys:16 Silverado LT;16 Malibu LT2;'17 Impala;'16 MalibuLT;'15 Camaro LS;'15 Traverse; '13,'12 and '07 Avalanche LTs; '11 Tahoe LT; '13 &'11 Malibu LTs; '08 Trailblazer;'06 Colorado WT..... Chrysler era.....'80 Citation;'75 Impala;'72 Chevelle;'69 Camaro R/T;'65 Impala SS;'62 Nova
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post #43 of 54 (permalink) Old 07-16-2019, 11:10 AM
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wow, was not aware of the brake life monitor.
But appears it does have thickness sensors.



Went and found this....


How It Works


Your vehicle has software that uses your vehicle’s information to estimate the wear on your brake pads. The Brake Pad Life Monitor includes front and rear pad thickness sensors. It uses these sensors to adjust the estimate of your brake pads’ life based on your driving habits — this increases the monitor’s accuracy over time.
You’ll see brake pad life is displayed in your vehicle’s Driver Information Center. When the system detects that your brake pads need to be replaced, a message will display. If you don’t replace the brake pads immediately and they continue to wear down, you’ll hear the traditional mechanical wear indicators on the pads — they’ll begin to squeal, which indicates end of pad life.
The Brake Pad Life Monitor will need to be reset when you replace your brake pads.


Apparently the 2019 Camaros have an air filter monitor... I dont know if its similar to the Silverado....


The new, 2019 Chevrolet Camaro‘s engine air filter monitor works by measuring for a sizable drop in air pressure as fresh intake air passes through the filter; the more clogged the filter is, the greater the drop in pressure from the snorkel side to the engine side. It does this each and every time the engine is run, and as soon as the measured pressure drop passes a certain threshold, the car issues an alert to the driver that it may be time to replace the filter.

2010 FWD LT1-Gold Mist Metallic- seats 8.
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.

2013 Equinox 3.6L - 88,000
2010 Traverse 3.6L- 153,000
2003 Trailblazer 4.2L- 181,500
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post #44 of 54 (permalink) Old 07-16-2019, 11:45 AM
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I picked up the Silvy with 2 miles on the odometer. There's no way driving 125 miles on a dust-free clear day can reduce air filter life expectancy by 10%. Or a handful of stops at no more than 10 traffic lights and 4 stop signs on 25 mile runs back and forth to the dealer can reduce brake pad expectancy by 1%. Doubt any cheapo GM sensor is even accurate to +/- 1%.



Projected 1,250 mile life expectancy on the air filter - projected 12,500 on the brake pads? Only proves these sensors are just as unreliable as the DIC readout.



Before it was just the OLM handing garbage out seems with these new fantastic sensors monitoring has progressed to garbage in - garbage out. I'll continue to rely on non idiot light visual indicators and non OLM decision maker called eyeballs and a brain.

Current Chevys -'19 Silverado RST;'18 Malibu LT Redline;'18 Traverse Premier Redline<br /><br />Previous&nbsp; Chevys:16 Silverado LT;16 Malibu LT2;'17 Impala;'16 MalibuLT;'15 Camaro LS;'15 Traverse; '13,'12 and '07 Avalanche LTs; '11 Tahoe LT; '13 &'11 Malibu LTs; '08 Trailblazer;'06 Colorado WT..... Chrysler era.....'80 Citation;'75 Impala;'72 Chevelle;'69 Camaro R/T;'65 Impala SS;'62 Nova
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post #45 of 54 (permalink) Old 07-16-2019, 12:07 PM
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yeah, I agree with you.
It will be interesting to see what happens.


Almost like the OLM on my 2010.
when reset to 100%...
the 1st drop to 99% happens after 40 miles (or was it 60?).


then after that- it occurs at/near 100 miles per 1%.

2010 FWD LT1-Gold Mist Metallic- seats 8.
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.

2013 Equinox 3.6L - 88,000
2010 Traverse 3.6L- 153,000
2003 Trailblazer 4.2L- 181,500
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post #46 of 54 (permalink) Old 07-16-2019, 12:11 PM
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Quote:
Originally Posted by Thomcat View Post
02.



I agree, but more than that it is a deceiver. It projects the impression that it is scientifically monitoring vehicle health and maintenance systems just like the OBDII system when in fact unlike the OBDII it is not providing a conclusion directly from signals from individual engine and body sensors, only indirectly passively monitoring all signals, relevant or not, fed to the ECU "divining" a conclusion. Worse than that the conclusion can be faulty because it is based on partial data, lacking sensor feedback in critical areas and making assumptions that the correct oil, filters and service parts were substituted or whether they were even replaced when the OLM was reset.



This is how smart the dumb thing is.......calculates that after 125 miles of driving in clean mountain air, my air filter has lost 10% of its' useful life......guess I'll be up for an air filter change at 1250 miles, a few short of the 45K mile schedule printed in the owners manual.....calculates that after 125 miles of open driving with less than 40 stops for traffic lights and stop signs the brake pads are 1% worn, guess I'll need new pads at 12,500....
Actually it's very easy to set an air filter life monitor using the MAP sensor in the intake to monitor vacuum for a given throttle position or mass of airflow, and using barometric pressure prior to startup as the base point, which the ECM does anyway. More vacuum at the same throttle position indicates a greater intake restriction.

It would make sense for a drive up through high altitude to show as a theoretical loss of filter life since the MAP would now be seeing lower pressure compared to the start at a lower altitude, and assume it is thus pulling more vacuum and the restriction from the filter has increased.

I can't find much information out there on the '19 Silverado system and how it is programmed, but that would be a pretty effective way to do it. IIRC the GMT400s had a simple mechanical indicator on some of the trucks sold in high dust areas.

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post #47 of 54 (permalink) Old 07-16-2019, 02:40 PM
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Actually it's very easy to set an air filter life monitor using the MAP sensor in the intake to monitor vacuum for a given throttle position or mass of airflow, and using barometric pressure prior to startup as the base point, which the ECM does anyway. More vacuum at the same throttle position indicates a greater intake restriction.

It would make sense for a drive up through high altitude to show as a theoretical loss of filter life since the MAP would now be seeing lower pressure compared to the start at a lower altitude, and assume it is thus pulling more vacuum and the restriction from the filter has increased.

I can't find much information out there on the '19 Silverado system and how it is programmed, but that would be a pretty effective way to do it. IIRC the GMT400s had a simple mechanical indicator on some of the trucks sold in high dust areas.
I was going to post the exact thing, it might be pulling data from the MAP/MAF and that mountain air mentioned is thinner, it might think that there's blockage or a reduction in the air filter and therefore filter life has decreased.
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post #48 of 54 (permalink) Old 07-17-2019, 12:38 PM
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Let’s not trust banks or any technology either!
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post #49 of 54 (permalink) Old 07-17-2019, 06:46 PM
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I've always trusted and used the OLM on my Traverse (12' - LTZ) and I'm currently at 110K. I've also always used the dealer to change the oil as we have a $17 oil change special for life with the purchase of our vehicle and I can't get the oil and filter for that as well as my time

Spoke to the oil service guy today as my wife always takes it in and I was with her today and was curious what oil they are using. In the past (when we first got the car new) they used Valvoline synthetic blend and today I found out that GM switched to a GM brand (Dexos) 100% synthetic a couple of years ago. I'm kinda surprised and pleased as that's a really good price for Synthetic and it makes be feel better for sticking to the OLM. I'm sending the oil off to have it analyzed by Blackstone and we'll see how it's holding up. We had 5% left of the OLM when changed and there was 6800 miles on the oil and for Synthetic that's not bad. My guess is the OLM would have taken it to a tad over 7K and it seems to be looking pretty accurate. I'll update once I have the analysis back.
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post #50 of 54 (permalink) Old 07-18-2019, 11:00 AM Thread Starter
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The ping ponging back n forth on this closely models my thinking on it... sometimes I'm in 'corporate scam' modeand other times I'm thinking the OLM is a useful, accurate tool. My biggest concern is the fact the manual (unless I missed it) doesn't recommend a milage to change the oil, and relies on the OLM. So in terms in starting in warranty compliance, I feel like I need to follow the OLM's recommendation, which could be a scam.
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