According to factory maintenance recommendations for the 2010 Ford Escape, severe service spark plug change interval is 60K and typical use is 90K I think. Well, I think either 90K is far too long or this car was used under "severe service" by the prior owner because changing these made a HUGE difference on my Escape which has about 65K miles. It runs MUCH smoother, much less vibration at idle, and the instant MPG calculation is about 1.5-2MPG better in the same driving conditions. I went from hating this car's excessively vibrating and poor performing engine to being impressed with how well it runs.
If you have an Escape, Fusion, or other car with the 2.5L engine, you should really consider changing them every 50K even if you drive the car normally - you'll be much happier with the performance and smoothness. Plus, plugs are cheap, it'll pay for itself in fuel savings. The old ones didn't look bad, but I guess they were bad, simply because of how much better the car is now. I used Motorcraft Iridium SP530 plugs.
If you have an Escape, Fusion, or other car with the 2.5L engine, you should really consider changing them every 50K even if you drive the car normally - you'll be much happier with the performance and smoothness. Plus, plugs are cheap, it'll pay for itself in fuel savings. The old ones didn't look bad, but I guess they were bad, simply because of how much better the car is now. I used Motorcraft Iridium SP530 plugs.
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