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Old 09-01-2010, 03:38 AM   #1
Unleashedbeast
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Default Increased oil weight and MPG improved, Possible?

All of us know that Ford specs 5W-20 engine oil for the 4.6L modular V8. There are many rumors as to why this happened, as previous generations required 5W-30. Many of those previous generation 2V modulars were also downgraded from a 5W-30 spec to a 5W-20, and nothing internal changed.

So why the spec change? CAFE laws, and no other reason. The 1/16 mpg gain from using a lighter oil (dino versus dino - not dino versus full syn) might be insignificant to you as the end user, but it saved Ford a fortune in fines to the federal government for not meeting the fuel economy mark of 27.5 mpg.

Quote:
  • What is the penalty for not meeting CAFE requirements for any given model year (MY)? The penalty for failing to meet CAFE standards recently increased from $5.00 to $5.50 per tenth of a mile per gallon for each tenth under the target value times the total volume of those vehicles manufactured for a given model year.

    Since 1983, manufacturers have paid more than $500 million in civil penalties. Most European manufacturers regularly pay CAFE civil penalties ranging from less than $1 million to more than $20 million annually. Asian and domestic manufacturers have never paid a civil penalty.

  • What are CAFE credits? Manufacturers can earn CAFE “credits” to offset deficiencies in their CAFE performances. Specifically, when the average fuel economy of either the passenger car or light truck fleet for a particular model year exceeds the established standard, the manufacturer earns credits. The amount of credit a manufacturer earns is determined by multiplying the tenths of a mile per gallon that the manufacturer exceeded the CAFE standard in that model year by the amount of vehicles they manufactured in that model year. These credits can be applied to any three consecutive model years immediately prior to or subsequent to the model year in which the credits are earned. The credits earned and applied to the model years prior to the model year for which the credits are earned are termed “carry back” credits, while those applied to model years subsequent to the model year in which the credits are earned are known as “carry forward” credits. Failure to exercise carry forward credits within the three years immediately following the year in which they are earned will result in the forfeiture of those credits. Credits cannot be passed between manufacturers or between fleets, e.g., from domestic passenger cars to light trucks.
http://www.nhtsa.gov/cars/rules/cafe/overview.htm

All Ford modular V8 engines in Australia are spec'd for 5W-30 because they do NOT have CAFE laws in their country. Even the 3V is spec'd the same.

Many posters on here, and other forums, have questioned if a 30W oil would harm the new 3V modular. Some have said, "the variable valve timing is dependent on 20W oil. Do not use a heavier weight or it will not function correctly." I find this to be complete BS....and this is why!

I decided to stray from the 20W spec and take the advice of a trusted peer. Him, and others, began using AMSOIL AZO 0W-30 in their 4.6L modulars with great success. I wanted to share my results and experience with fellow members here, as maybe they would be interested to get more out of their modular.

Let me give a back story....

I was using Mobil 1 5W-20 API SM oil in my Mustang for testing purposes (first 30,000 miles of the engines life). Their reputation was top notch long ago, so you can trust their formulation, right? Most of you know how I truly feel about it, but I needed a popular choice for this comparison. Let's move on to fuel economy and coolant temperature comparisons.

I make frequent trips to see family out of town, and I drive the same direction, same time of night, same speed, etc. With Mobil 1 I always averaged 24.5 MPG (constant speed with cruise control of 80 MPH) on the digital read out (verified to be ~2% off versus manual calculations).

With AMSOIL AZO 0W-30 (5,000 miles of the engines life) the same trip and all other parameters the same I averaged 25.5 MPG. *Please note that time of year and ambient temperature were the same - also verified to be ~2% off versus manual calculations*

Click the image to open in full size.

*all memory settings were reset for the trip including mpg, odometer, etc.*

Overall I gained 1 MPG @ an average of 80 MPH. *Holding consistent speed for a minimum of 100 miles*

*My car in another test averaged 29.3 MPG @ 60 MPH with the same conditions*

The next thing I noticed was decreased coolant temperature. I've seen a average of 5* decrease in coolant temperature decrease on my Diablo Predator tuner. I was curious to check the reading when I noticed my in dash temp gauge was reading less than half way. It always read half way until the lubricant change.

Click the image to open in full size.

So now I know that I actually gained efficiency from a heavier weight oil, but how is that possible you may ask. Allow me to help you understand it better.

- 100% synthetic oil has molecules that are uniform and consistent. Let's do an analogy. Take a pile of rocks that are many different shapes and sizes and let's compare that to a pile of steel marbles of uniform shape. If you were to stir both piles with your hand, which pile do you think would have less friction and was easier to circulate each particle? Of course, the pile of marbles would. They would produce less friction because they glide past each other easier than the rocks would. Less friction means less heat (engine temperature) and more efficiency (higher miles per gallon).

Even though the lubricant weight was increased, the friction of the lubricant was decreased. So not only did I improve efficiency and decreased heat, I also improved the film strength of the lubricant with improved shearing stability. This means overall better protection for my engine which will assure me of a very long life.

Want to know more about the oil of choice for year round use my Mustang? AMSOIL evens recommends it for our cars.

AMSOIL AZO 0W-30

For summer aggressive driven cars, and supercharged engines, I prefer this

Amsoil ATM 10W-30

Read this thread to understand why 10W-30 is preferred. Read post #30 and #31

Team Shelby - Why 10W-30

Just looking out for my fellow Mustang owners.

*Post edited due to Amsoil renaming their 0W-30 to "AZO", and wanted to eliminate any confusion*
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Old 09-01-2010, 04:35 PM   #2
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I had a similar result, when I switched my S-10 from 5W-30 to 5W-40 my average fuel economy on road trips averaged just over 23mpg traveling at 55mph. The average fuel economy with the 5W-30 would stay just under 21mpg at 55mph. I've been watching the average fuel economy for a long time and was puzzled when I suddenly started getting better gas mileage out of a vehicle with so many miles on it...the only thing that I changed was the weight of the oil. On a side note, I stop and go a lot while working; during a day of work my mpg would stick around 15mpg on the 30 oil and has slightly increased to 16mpg with the 40.

Nice article man, great read.
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Old 09-01-2010, 08:55 PM   #3
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Where do you find time to write up these posts?



Oh yeah while you are @ work.....


Rock on!~
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Old 09-01-2010, 09:45 PM   #4
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Originally Posted by ShadyNinja View Post
Where do you find time to write up these posts?



Oh yeah while you are @ work.....


Rock on!~
Funny guy, although you are right sometimes. This one was actually written on my own time at 3:00 am. Normally, I would have been at work at this time, but it was a night off. I had to do something to keep me awake, and while it was fresh on my mind....I went ahead and put it together.

Gotta let the world know how great this stuff is.
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Old 09-02-2010, 10:47 PM   #5
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on a side note when you have a gauge that goes into warning (like when fuel gets real low) the gauge that needs your attention turns red to let you know something is up. but with the color set up you are using you wouldn't even notice lol

I freaked out it happened to me 1 time.
I needed gas and I pulled off the highway and all they had was 87, had to keep going to get some premium. that was scary, next road trip a bottle of octane boost goes in the trunk.
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Old 09-02-2010, 11:10 PM   #6
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Quote:
Originally Posted by ShadyNinja View Post
on a side note when you have a gauge that goes into warning (like when fuel gets real low) the gauge that needs your attention turns red to let you know something is up. but with the color set up you are using you wouldn't even notice lol

I freaked out it happened to me 1 time.
I needed gas and I pulled off the highway and all they had was 87, had to keep going to get some premium. that was scary, next road trip a bottle of octane boost goes in the trunk.
I always had the mycolor display set to green until recently. When I test drove my car the first night, it was set to green. The miles to empty was about 6, and the gas gauge switched to red. I thought that was cool, but you know there are still dummies who run out of gas in this car.
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Old 09-03-2010, 08:15 AM   #7
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What I get is that Amsoil with a higher hot viscosity number and presumably a greater concentration of VI improvers is an improvement over M1 of "stock-spec" for the 3V engine.

Any idea how the improvement breaks down as far as the viscosity effect vs the effects of other formulation differences?


I'm not particularly afraid to run an oil with a hot viscosity number of 30 - it seems that 30 hot is still thinner than 5 cold when I change the oil in the car that specifies 5W30.


Norm
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Old 09-03-2010, 06:46 PM   #8
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Norm,

After some research I was understanding that AMSOIL's SSO uses less VI due to it's lack of group III base stocks. The superior group IV doesn't need as much "improvement" to perform as intended. Also, since there are less VI added, the resistance to shearing is increased. It will remain a 30W oil for most, if not all, of it's usable life.
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Old 09-04-2010, 09:05 AM   #9
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Thanks, Troy.


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Old 09-04-2010, 06:25 PM   #10
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You are welcome sir!

Anything I can do to better serve our Mustang community.

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Old 09-04-2010, 06:25 PM
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