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Thread: Engine Oil Life and Miles Per Gallon Pids:

  1. #1
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Default Engine Oil Life and Miles Per Gallon Pids:

    Hey guys and Gals, I need some help. I successfully selected the Engine Oil Life Pid , and the calculated MPG Pid. I can successfully log each and have been very intrigued on how the engine oil life monitor works.

    I have always used Mobil 1 synthetic oil, and I want to switch to their premium Extended life Oil, which claims a 15,000 change interval. Can I change the Oil Life Monitor to 'light" up at a different mileage interval, or is it 'hard-wired' into the PCM? Are there different calculations for different platforms.. [I.E. the Corvette ZO6 uses synthetic oil.] I know I can just reset the oil life monitor at any point to match what I want, but I am just curious to see if it possible to actually change its calculations on the change interval with my EFLive software.

    Perhaps I should have started a new thread on the following question, but on the MPG Pid..has anybody have a Calculated PID that can take your total mileage and calculate an average MPG. The current one is fascinating as it appears to give you an 'instantaneous' MPG, but one that gives an average would be great.
    Last edited by WeathermanShawn; February 9th, 2010 at 09:34 AM. Reason: Grammer..
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  2. #2
    Joe (Moderator) joecar's Avatar
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    Shawn,

    Interesting questions...

    I don't see any oil life parameters in the LS1 calibration file.


    average MPG = (total miles travelled) / (total gallons used)

    I don't know if the right pids are available...

    or...

    average MPG = integral(instantaneous MPG, t) / (elapsed time)
    unfortunately the scantool does not have an integrate() function at the moment...
    so you would have to do this offline in a graphing program or a spreadsheet.

  3. #3
    Lifetime Member Chevy366's Avatar
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    In a vehicle with a DIC doesn't it do 'estimated MPG' ? In the LS1-B tunes you can set [B3501-2] .
    The oil life tweak is a good idea , from what I have read the algorithm for that takes in a lot of variables to calculate the usage , duration , life etc ... http://www.cadillacforum.com/forum/a...hp/t-2103.html take it with a grain of salt . GM's words : http://www.gm.com/corporate/responsi..._qa_040104.jsp
    Last edited by Chevy366; December 4th, 2009 at 08:58 AM.
    2005 1500 HD , Custom OS3 SD tune .
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  4. #4
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Hey guys, I got the Engine Oil Life Pid (GM.EOL) validated and can currently log it. I read the original article by the developers of the GM Oil Life Monitor Algorithm (Google). It is interesting how they estimate engine oil temperature and the resulting oil life remaining. I think they start with 2.5 million crankshaft revolutions, and then calculate certain 'penalties' based on ECT on startup, revolutions, etc. It just sounds like it is engine specific. If I had a way of saying programing 5.0 million crankshaft revolutions, and calculate from there I would have it made. The Oil Life Monitor system is a pretty sophisticated algorithm.

    Guys on the mileage PID, I got the MPG PID to work. Lately I have just been using the average MPG from the data 'dashboard' at the end of my log. It actually has been very accurate.
    Last edited by WeathermanShawn; February 9th, 2010 at 09:34 AM. Reason: Typos..
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  5. #5
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    The GM OLS is actually very good. I follow it for oil changes on my TB SS.

    Here is a good article that explains the basics.

    http://www.goodwrench.com/_res/pdf/OLS1.pdf

  6. #6
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Quote Originally Posted by DrkPhx View Post
    The GM OLS is actually very good. I follow it for oil changes on my TB SS.

    Here is a good article that explains the basics.

    http://www.goodwrench.com/_res/pdf/OLS1.pdf
    Yea, I agree. It is very interesting algorithm and seems to be quite accurate. I did a few logs where I did shorts trips, highway driving etc. You definitely lose the most oil life on startups with cold ECTs. If you do a stop and go, it also decreases it more rapidly.

    So far, I have hit an average of ~55 statute miles per 1% of oil life usage. So, looks like I can get 5500 miles before my next oil change. But, it does not really account for those that choose the highest premium synthetic oils. And from the literature it appears that different cars have differing amount of crankshaft revolutions programmed before an oil change is required.
    Last edited by WeathermanShawn; February 9th, 2010 at 09:35 AM. Reason: Typos..
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  7. #7
    Senior Member Wolfie's Avatar
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    ..WeathermanShawn..
    on the subject of synthetic oils.... I don't advertise for anyone... but...
    I use amsiol synthetic 5w30... I have a 2007 chevy express 2500 extended van now, and my previous van was a 2003 ford e250 extended. the ford van got over 400,000 miles without engine problems, and my chevy (except for the new engine at 130,000 because when the cam went at 97,000 (was a tsb on bad construction) the local dealer wouldn't clean out the metal left in the engine) it now has 320,000 miles on it with no problems. I often haul up to 3,000 lbs... I change the oil between 22,000 and 28,000 miles!
    Wolfie
    LS1B 2007 Express 6.0 /w 470,000+ miles (parked as of 01April2011)

  8. #8
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Wolfie:

    I use synthetic oil, but I have not researched it as much as you have. I do the catch can and only run up about 8000 miles per year..but I run the car hard at times... I got the mpg pid to work. It does quite well for a trip average, but I am so used to figuring it out in my head..it is no big deal.

    It appears the Engine Oil Life Monitor system is 'hard-wired' as far as how many crank revolutions (and other interesting parameters) until light-up. It actually seems like a very accurate algorithm.

    Thanks for the information.
    Last edited by WeathermanShawn; February 9th, 2010 at 09:35 AM. Reason: Grammatical Errors..
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  9. #9
    Senior Member Wolfie's Avatar
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    I use the Elite Engineering's PCV Oil Catch Can for the C5 and C6 Z06 Vette, it doesn't accumulate all that much. I ran a drain hose from the can down under the front bumper.
    What might I ask, did you come up with for the mpg pid? I check my milage at every fill, which adds up to a lot of time, seeing as I fill up sometimes 3-4 times a day.
    Wolfie
    LS1B 2007 Express 6.0 /w 470,000+ miles (parked as of 01April2011)

  10. #10
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Interesting on the catch can.

    I ended up using the same brand you mentioned. Likewise, it does not collect that much.
    Last edited by WeathermanShawn; February 9th, 2010 at 09:35 AM. Reason: Redundant..
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


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