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  1. #1
    Elite Member
    Join Date
    Mar 2006
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    3,059
    Location
    Wisconsin
    Tractor
    2003 NH TN70A

    Default GM Oil Life Monitor

    I wish my tractor had an oil life monitor like my current Chevy has and my Cadillac had. Right now (at 3700 miles) my oil life monitor says I have 78% life left in the oil. I would have chnaged the oil 700 miles ago.

    I have learned how changing the oil every 3 months or 3,000 miles was a waste of oil, time and money.


    Bob

  2. #2
    Veteran Member
    Join Date
    Oct 2005
    Posts
    1,534
    Location
    Cincinnati, OH
    Tractor
    Kubota B3030

    Default Re: GM Oil Life Monitor

    Quote Originally Posted by Doc_Bob
    I wish my tractor had an oil life monitor like my current Chevy has and my Cadillac had. Right now (at 3700 miles) my oil life monitor says I have 78% life left in the oil. I would have chnaged the oil 700 miles ago.

    I have learned how changing the oil every 3 months or 3,000 miles was a waste of oil, time and money.


    Bob
    I always have thought that 3000 mile changes was an absolute joke. But Ive seen trannys go bad...windshield wipers go hay-wire...even whole dashboards go dead. Im not going to trust my engine to some gizmo that tells me my oil is still good or not.
    Kubota B3030 with 40 amp alternator kit; LA403 FEL; 60 inch backblade; sub-soiler; ballast box; EzMover hitch; Payne clamp-on bucket forks; a HD set of smaller discs and a 60" landscape rake with dolly wheels
    Hobart HH210 Mig welder

  3. #3
    Veteran Member
    Join Date
    Sep 2001
    Posts
    1,771
    Location
    Kansas
    Tractor
    Kubota L3000DT

    Default Re: GM Oil Life Monitor

    This is pure speculation on my part, but I am almost certain they are not measuring any property of the oil itself at all. I would guess that they count the number of starts, total miles, miles driven while less than warmed up, etc. and make a prediction regarding the health of the oil. I'm with Sully, I doubt that I'd ever completely trust that thing.
    Meetings: If more than two people are there, at least one's time is being wasted.

  4. #4
    Veteran Member
    Join Date
    Jan 2007
    Posts
    1,561
    Location
    Central Lower Michigan
    Tractor
    Kioti DK40SE

    Default Re: GM Oil Life Monitor

    CP, I'm 99% sure you are correct in how it works. But I still think it is a reasonable guess and reasonable to follow. I have had a GM vehicle with the OLM for about 5 weeks now. 1500 miles after my first change, OLM is indicating 85% life left. Virtually every trip I take is >15 miles and lets the oil get and stay at full operating temp for a while, so this seems entirely reasonable. I'm not likely to wait until 0% oil life left to change, but if the OLM says I still have 50% life at 4000 miles - which seems very likely - I may feel comfortable going 6-8k miles between changes.

  5. #5
    Super Member
    Join Date
    Sep 2000
    Posts
    6,553

    Default Re: GM Oil Life Monitor

    Oil has improved VASTLY from the 40's and 50's when it was worn out by 3000 miles. Heck, by modern standards, oil from the 40's would be worn out when new!

    The only way to KNOW for sure is by a chemical oil analysis. Blackstone, CAT and others offer the service for 20-30 bucks. Check your oil at 5, 7, 10, 12k and you will see how it's life is fairing. Any other method is little more than a WAG or in the case of the OLM, a SWAG.

    Still, today most oils are good for at least 10k miles and often much more. Depends on the engine and driving habits. Aside from falling prey to the rapacious greed of the oil companies, there is no down side to changing early.

    jb

  6. #6
    Elite Member
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    Mar 2006
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    3,059
    Location
    Wisconsin
    Tractor
    2003 NH TN70A

    Default Re: GM Oil Life Monitor

    Quote Originally Posted by john_bud
    Oil has improved VASTLY from the 40's and 50's when it was worn out by 3000 miles. Heck, by modern standards, oil from the 40's would be worn out when new!

    Still, today most oils are good for at least 10k miles and often much more. Depends on the engine and driving habits.
    jb
    The more I read the more I understand that oils are very good now. 3K is old news. I have not seen a new car call for 3k oil chnages. Many are 12 months or 7500 miles. I am okay with 5k easy and with the OLM I am sure I can go longer. Will I go to 0%? No way!! But 3k oil changes seem not to make sense??
    Bob

  7. #7
    Silver Member
    Join Date
    Dec 2004
    Posts
    173
    Location
    McKean county, Pa.
    Tractor
    John Deere 4110-HST

    Default Re: GM Oil Life Monitor

    My 2004 Buick LeSabre has the oil monitor also. Have 32,000 miles on it now.
    I have been changing the oil when the monitor was reading 20% to 25% left.
    I think it has been changed 4 times. Along with filter of course. The dealer
    decided the schdule. Most trips are 15 to 20 miles and a few much longer.
    Getting close to the next change. I think. Just my 2cents too. elad

  8. #8
    Veteran Member
    Join Date
    Oct 2005
    Posts
    1,432
    Location
    N. E. Ohio
    Tractor
    tc- 29d

    Default Re: GM Oil Life Monitor

    the OLM moniters the vehicle operation and the driver operation. It watches transmission temp, coolant temp, eoil temp, shift patterns, miles between start and stop of engine. It does a good job at predicting when oil needs to be changed. Remember that a computer is "running" your vehicle today. If OLM malfunctions, you will be prompted to have it seviced. I have gone as high as 9700 on an oil change in a 1500 Silerado with a 5.3 motor.
    dqdave1; tc-29D; woods 7500 bh; 7308 fel, land pride tiller, land pride rake, gill pulverizer, 60"mmm. , bucket forks , MZ16H

  9. #9
    Gold Member
    Join Date
    May 2005
    Posts
    415
    Location
    Columbia County, PA
    Tractor
    JD1010, JD B, TC40A (new)

    Default Re: GM Oil Life Monitor

    I have the OLM in my GMC turck and I usually change when it gets around 20% oil life. Mileage at this point is around 6,000 to 7,000 miles and the oil still looks pretty good but I still change it. I'm going to change it this weekend and was thinking of sending in some for an OLA just to see what it tells me.

  10. #10
    Elite Member
    Join Date
    Mar 2006
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    3,059
    Location
    Wisconsin
    Tractor
    2003 NH TN70A

    Default Re: GM Oil Life Monitor

    Quote Originally Posted by dknarnd
    I have the OLM in my GMC turck and I usually change when it gets around 20% oil life. Mileage at this point is around 6,000 to 7,000 miles and the oil still looks pretty good but I still change it. I'm going to change it this weekend and was thinking of sending in some for an OLA just to see what it tells me.
    The OLA results would be awesome!
    Bob

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