The monitoring system on my 2015 GMC Terrain provides a "remaining oil life percentage" and it says 40 per cent remaining. My repair shop says that following the percentage monitor will lead to premature engine failure after the warranty runs out. I don't know who to trust. – Doug T., Edmonton
Skepticism was my initial reaction after seeing the first vehicles with oil life percentage monitor systems. However, as I educated myself as to how these systems work, my opinion gradually migrated to that of acceptance.
There is no sensor in the engine that senses oil condition, rather oil life expectancy is calculated by complex algorithms using data from driver throttle input, engine load conditions, altitude and ambient temperatures all determining when that oil change is due. There is nothing wrong with performing your oil change early to suit each owner's comfort level. In fact, I encourage customers to start thinking oil change when within their last 25 per cent – simply because people forget.
The system does have a couple caution areas, firstly for people who are tardy with their maintenance. When the system shows "change oil now," it means change the oil now, not in 2,000 kilometres. There is no forgiveness with this system.
Secondly, this system is dependent on accurately resetting the system. If the speedy lube tech forgets or doesn't completely reset the system, you will find yourself backtracking, trying to figure out when your next service is due.
Lou Trottier is owner-operator of All About Imports in Mississauga. Have a question about maintenance and repair? E-mail globedrive@globeandmail.com, placing "Lou's Garage" in the subject area.
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