OLM Percentage
Administrator
Joined: Mar 2001
Posts: 368,522
Likes: 24,821
From: In a parallel universe. Currently own 2014 Stingray Coupe.
C7 of the Year - Modified Finalist 2021
MO Events Coordinator
St. Jude Co-Organizer
St. Jude Donor '03 thru '26
NCM Sinkhole Donor
CI 5, 8 & 11 Veteran
I change mine when it hits about 5% or so, but yes, it will read 0% eventually.
Race Director
Joined: Apr 2007
Posts: 16,025
Likes: 1,656
From: Toronto, Canada
C7 of the Year - Unmodified Finalist 2021
Yes it does go down to zero and mind you it counts down about 8 percent every month whether or not it is driven to bring it down to zero within 12 months.
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Joined: Nov 2020
Posts: 60
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From: The Villages, FL
Tech Contributor
Joined: Oct 1999
Posts: 41,062
Likes: 9,825
From: Charlotte, NC (formerly Endicott, NY)
GM's OLM algorithm works very well in determining when the oil is changed. The change to take into account the time since an oil change came about with the C7s. I suspect that GM added the time period in to force some people to change their oil every year. I know some garage queen owners used to justify not changing oil for years because they didn't put many miles on their cars and after a year the OLM still indicated over 50% oil life.
Bill
Bill