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Yes, heavier oil will help with the consumption, but it often causes other problems. The lighter oil is not just for fuel mileage, but is also used as a hydraulic fluid for actuators, valves and such like in a transmission. The small passages are not always ideal for heavier oil. The VVT in your Mazda is a perfect example. Glad you didn't have problems, but in general I would not recommend to someone to do as you did for consumption.

For this car, plenty of people using the higher viscosity in both the V6 Fusion and Mazda version (same engine). The dealer, at my recommendation, is doing the changes, so don't see any damage on the horizon. 10-50.....and might be a different story.

Not recommending anyone start adjusting oil viscosity at random. A visit to bob is the oil guy will give you a pretty good idea of options when it comes to oil for specific vehicles.

No doubt oil use can pinpoint other issues (PCV etc). I did check other possibilities with nothing found and higher viscosity is an easy fix.
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