Oil change interval is an area of much confusion and debate among automotive enthusiasts, manufacturers and service technicians—and it rages on with alternative fuel vehicles as well as regular vehicles. Conventional wisdom holds that change intervals should be limited to a maximum of three months or 3,000 miles, but that is something of a misnomer. Actually, most manufacturers recommend oil change intervals of 7,500 miles or once-a-year under normal operating conditions or 3,000 miles/3-months under severe operating conditions. And in Europe it’s not uncommon to see oil changes exceeding 10,000 miles.
Here’s really where the confusion begins—what constitutes severe operating conditions?
- frequent short trips
- sustained high speeds in hot or cold weather
- severe dusty conditions
- extremely humid conditions
- trailer towing
- mountainous or steep terrain
Most drivers would classify their own particular driving circumstances to fall under the normal conditions category, which may or may not be true. In the United States in particular, the 3,000 mile/3-month frequency has been adopted by the status quo as a cover all conditions mentality—but in many cases this practice proves unnecessary and wasteful. As a final resolution, many auto manufacturers are equipping vehicles with an oil monitoring system that will tell the vehicle operator exactly when to change the oil, no questions asked.
Let the Vehicle Figure it Out
Instead of arbitrarily changing out the fluid at a prescribed time or mileage (regardless of condition), the vehicle's onboard computer makes the decision—potentially saving a few million gallons of perfectly good lubricant. Through sensors and algorithms, the computer determines how many hours the oil has been in operation, the load and speed conditions the vehicle has been operated under, how often the oil has been brought up to full operating temperature, and sundry other parameters that affect engine oil life. It's the true litmus test of engine oil life. Will this ultimately solve the problem? It should help a lot, but old habits do die hard. It may take a generation change before folks are willing to give up their "If it was good enough for Daddy, it's good enough for me" belief systems.Check out General Routine Maintenance for Alternative Fuel Vehicles to see the schedule for all recommended service intervals.