How exactly do Oil Life Monitors work?
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 3 of 3
Northstar Engines and System Technical Discussion Discussion, How exactly do Oil Life Monitors work? in Cadillac Engine Technical Discussion; My father has a 94 DeVille Concours, and he believes that the OLM bases its % by a 5,000 mile ...
  1. #1
    fpmesiIII's Avatar
    fpmesiIII is offline Cadillac Owners Fanatic
    Automobile(s): 1996 Cadillac Seville STS (167k)
    Join Date
    May 2005
    Location
    Western NY
    Posts
    473

    How exactly do Oil Life Monitors work?

    My father has a 94 DeVille Concours, and he believes that the OLM bases its % by a 5,000 mile interval. I was wondering what do these OLM base their % on? and how do they do it? and do they differ from say a 1994 N* to a 1996 N*? and do they differ from different vehicles, say from a Cadillac to a GMC?

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    JimD is offline Cadillac Owners Connoisseur
    Automobile(s): '98 STS (RIP @ 206,xxx miles)
    Join Date
    Sep 2003
    Location
    Atlanta area
    Posts
    4,754

    Re: How exactly do Oil Life Monitors work?

    I am only parroting what I have read here and other GM/Cadillac specific boards that are or were frequented by insiders.

    The patented GM oil life monitor is specific to each power plant. There is a max. mileage interval built in that varies according to engine design (pushrods vs. OHC vs. OHC with roller cam followers). There will also be a max. calendar interval in the Owners Manual service schedule.

    The fundamental baseline data for oil life countdown with the GM system is a count of how many times the crankshaft/camshaft(s) rotate. That basic data point is then adjusted/modified/tweaked by more data such as engine temperature, engine run time, and an exhaustive list of other variables to predict when the oil should be changed (including a substantial safety factor). The details should be in the patent documentation.

    Just know that you can trust the system to predict when an oil change is due no matter the mix of driving conditions and styles. I do.

  4. #3
    STS-in-Nottingham is offline Cadillac Owners Fanatic
    Automobile(s): 1999 STS (Z rated, Right hand drive)
    Join Date
    Nov 2004
    Location
    Nottingham UK
    Age
    53
    Posts
    207

    Re: How exactly do Oil Life Monitors work?


Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting