Originally Posted By: Whimsey
It's not a GM but our 2017 2.3 EB Explorer tracks almost perfectly at a 10% loss per 100 miles for a 10,000 mi OCI.
Same here on a '15 Ford CMax Hybrid (which technically only runs the engine about half the miles driven, no kidding). I once thought Ford's iOLM ("i" for intelligent) was really intelligent. There is a 1-year limit of course too.
My '18 Equinox had its OLM triggered at EXACTLY 7,500 miles (less than 1 year too). It won't let it go over a year, for all you short-trippers out there.
GM is having trouble getting
soot concentration predictions into their OLM algorithms as of now. Thats why they have dumbed it down to a 7,500 maximum.
A Dow Chemical tribologist once said “GDI engines tend to produce more soot, which can impact timing chain wear."
and Infineum said DI's soot is tough on chains too.
https://www.infineuminsight.com/insight/oct-2016/timing-chain-wear
Someday, GM will ask you if you are using a limited list of oils and adjust the OLM upward. For example, they already are in cahoots with Exxon-Mobil for their Mobil1 line, mentioned right in the latest Owner's Manuals too, so they could allow one to go more miles and time on Mobil1 Extended Protection and Mobil1 Annual Protection. Exxon-Mobil is going to great lengths to push "Don't Change Your Oil" in ad campaigns, and projects (proof) such as
https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4806775/1