I used Mazda Moly oil and mileage increased

[fvansan]

I have 22,000 miles on my 2014 CX-5 GT. For the first tim, I tried the Mazda Moly and so far mileage increased from an average of 24 mpg to 29 mpg. Obviously is is not my driving style that changed so it must be the addition of Moly.

 

[MikeM.]

I have 22,000 miles on my 2014 CX-5 GT. For the first tim, I tried the Mazda Moly and so far mileage increased from an average of 24 mpg to 29 mpg. Obviously is is not my driving style that changed so it must be the addition of Moly.

I noticed a small increase in MPG after switching to the Mazda molybdenum oil but not 5 mpg! I would guess some of the increase you noted is due to natural fluctuations in accuracy of measuring MPG. Fuel tank fill level is probably the biggest variable.

 

[fvansan]

It is what it is. Car seems to run smoother, but that is subjective.

 

[robertmazda]

While there may be a small MPG increase due to the oil, there's no way you're going from 24 to 29 due to the oil. That's a 20% increase and simply not possible due just to the oil. MPG is so important to the manufacturers that if it were this simple then all cars would come with and recommend this oil. Mazda does not specifically recommend this over Castrol. For that kind of increase they obviously would.

 

[erhayes]

In the long term, I expect the Mazda moly oil over the std synthetic may give up 0.5 mpg and even this much might be only provable in a laboratory environment. Ed

 

[inlinev]

So you drove 22k miles with an average of 24mpg and how long did you drive before you reached your conclusion? One tank? This isn't subjective...

 

[raden]

I have to say that I noticed a decrease in average MPG since my last oil change on 10/10. Firestone used regular synthetic oil and I noticed my MPG went from an average of 28 to 26.

This is based on the built-in trip computer and fill up tracking. My driving has not changed, and weather temperatures have not been too cold until the past week.

I don't have the luxury of doing these changes myself and I didn't feel like going to the dealer.

 

[inlinev]

Ill play devils advocate since apparently a single tank is enough time. I switched to the Mazda 0w20 last week and the first tank was no different than the last tank which had pennzoil 0w20.

 

[erhayes]

This I believe. No measurable difference in the real world. Ed

 

[GAXIBM]

This time of year mileage decrease could be cold weather or winter fuel that is less powerful.

 

[MikeM.]

This I believe. No measurable difference in the real world. Ed

I think the difference is measurable in the real world but only if proper controls are in place.

The increase in mpg (with moly) isn't immediate because it takes some running in to get the engine components "burnished" with moly. And when you switch back to low/non-moly oil, the decrease isn't immediate either because engine components will still be burnished with moly from previous fills. Also, on the first use of moly, much of the moly is consumed in the burnishing process so the best results won't be until the second change with moly.

 

[inlinev]

I think the difference is measurable in the real world but only if proper controls are in place.

The increase in mpg (with moly) isn't immediate because it takes some running in to get the engine components "burnished" with moly. And when you switch back to low/non-moly oil, the decrease isn't immediate either because engine components will still be burnished with moly from previous fills. Also, on the first use of moly, much of the moly is consumed in the burnishing process so the best results won't be until the second change with moly.

Practically all the synthetics have moly in them.

Here is virgin Mobil 1 0w20

http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=475190

 

[MikeM.]

Practically all the synthetics have moly in them.

That's why I specifically referred to "low/non-moly" oils.