Information On Engine Oil Life Monitor Operation Calculation (PIP5282A)
Publication date: 2018-04-19Reference number: PIP5282A
Supersedes refnos: 18-NA-125, PIP5282
INFORMATION ON ENGINE OIL LIFE MONITOR OPERATION CALCULATION
TECHNICAL SERVICE BULLETIN
Reference Number(s): 18-NA-125, Date of Issue:
Apr 19, 2018
| Supercedes: | This Bulletin replaces PIP5282A. Please discard PIP5282A. |
SERVICE INFORMATION
| Brand: | Model: | Model Year: | VIN: | Engine: | Transmission: | ||
|---|---|---|---|---|---|---|---|
| from | to | from | to | ||||
| Buick | GM Passenger Cars and Trucks | 2010 | 2018 | ||||
| Cadillac | |||||||
| Chevrolet | |||||||
| GMC | |||||||
| Involved Region or Country | North America and N.A. Export Regions |
| Condition | Since 2010, all GM vehicles have been equipped with the oil life monitor (OLM) system. The monitor calculates the percent of oil life remaining, based on 3 pathways. The OLM starts its calculation for all pathways after the first 50 miles (80 km) to account for marshalling and time before sale. Subsequently, calculations begin immediately after each reset. |
SERVICE INFORMATION
Oil Life Monitor Calculation Pathways:
- Engine revolutions - Oil life starts with a fixed number of revolutions and will decrease with each revolution. Cold / hot coolant temperature readings have multipliers that reduce engine revolutions pathway quicker depending on how far from the normal oil temperature the vehicle is operating.NOTE:
If the engine coolant temperature gets above 260°F (126°C), engine overheat condition, the oil life will go to 0%.
- Mileage from last reset - Starting with MY 2013, the OLM is capped at 7,500 miles (12,070 km) for all GM powertrains except the Volt. In perfect conditions, a vehicle would reach 7500 miles (12,070 km) from the last reset and the oil life left would be 0%.NOTE:
For the 2016-2018 MY Camaro, 2014-2018 MY CTS and 2015-2018 MY ATS equipped with the 2.0L LTG sold in Europe, the OLM is capped at 30,000 km / 1 year.
- Time - This pathway is a liner function, a fixed decrease in oil life for a given time after the oil life is reset. The oil life will drop to 0% after 1 year regardless of the amount of engine revolutions or how many miles since the reset.
NOTE:
The Volt uses a 2 year timer instead of 1 year. It also uses the engine revolution counter. It does not use the mileage pathway to count down.
SERVICE INFORMATION
| Version | 1 |
| Modified | Released April 19, 2018 |