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Old 10-19-2012, 06:55 PM   #1
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Documented proof synthetic oil gets better gas mileage?

I've never been a fan of synthetics but I'm challenging myself to get 10 mpg out of my 04 V10. Getting 9.5 now with lots of mods.
Does anyone have any "FACTS", not opinions that synthetics really get you better MPG? The Amsoil thing I do not believe.
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Old 10-19-2012, 07:09 PM   #2
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doubt you will get any better mileage from switching,but the synthetic won't burn off from heat like the dino oils will
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Old 10-19-2012, 08:17 PM   #3
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if youre looking to justify the use of synthetics... you will never get the full objective story unless you completely tear down and measure every component of the engine thats subject to wear... then reassemble and drive for xxx,xxx miles.
You can use an oil analysis service to get the 411 on the current state of your engine.
Then use synthetics and see if it makes any difference.
Will it add mpg... a very good possibility.
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Old 10-19-2012, 08:26 PM   #4
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Here's a copy of a post I made on another thread in the Ford motorhome chassis forum:

On Page 1 of Ford Motor Company's Article 02-1-9 the reason given for the change from 5w30 to 5w20 is for better fuel economy and nothing more.

I seriously doubt if the lighter weight oil will improve fuel mileage, but something to consider.. Good luck.

http://www.thedieselstop.com/faq/949...les/020109.pdf
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Old 10-19-2012, 09:07 PM   #5
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I'm a synthetic fan, but it's for wear purposes, not mileage. synthetics don't dirty themselves and maintain more consistent properties over a longer period of time. They flow better at all temperatures, so the stuff gets to the bearing surfaces faster.

but fuel mileage associated with lubricants has to do with pumping losses, which are related to viscosity. If you use a synthetic of the same viscosity as dino oil, then the fuel savings, if any, are negligible.

If you reduce the viscosity betting on the oil pump producing enough volume to keep the OP up despite the change, then you are likely to see a small increase, but again, probably negligible.
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Old 10-19-2012, 09:46 PM   #6
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I put Royal Purple in the rear dif, transfer case, 5 speed auto tranny and engine in a 2006 Ford Ranger 4x4 4.0 V6.
Mileage did improve.

Have you tried an engine tune?
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Old 10-19-2012, 11:13 PM   #7
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My thought is:
If you stand on a ladder you are closer to the moon.

If you use synthetic oil you will get better gas mileage by about the same percentage as you gained by standing on a ladder.
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Old 10-20-2012, 12:14 AM   #8
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Quote:
Originally Posted by Arch Hoagland View Post
My thought is:
If you stand on a ladder you are closer to the moon.

If you use synthetic oil you will get better gas mileage by about the same percentage as you gained by standing on a ladder.
This is my favourite answer... Going to steal that for future use elsewhere.
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Old 10-20-2012, 02:16 AM   #9
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Muscle Car (I think) did a complete change out with Royal Purple - Oil, tranny, and diff - and got a consistent 8% improvement of power to the rear wheels. Better efficiency, better mpg.

Hot Rod mag did an Iridium spark plug test and got a consistent 4% improvement.

I swapped out a bad alternator and volt regulator on my 1985 Dodge Ram 318 and went from 12.5mpg to a consistent 13.75mpg.

The point being, you want better mpg, you need to improve/maximize efficiency.
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Old 10-20-2012, 06:00 AM   #10
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If there were any facts, it's not going to apply to a 10 ton RV. If you think about the bearing surface area of a V10, then think about using an oil that is going to reduce friction enough (over another modern oil) to give your 10 ton MH a 5% increase in mpg, hopefully you have your answer.
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Old 10-20-2012, 12:06 PM   #11
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I always look forward to the ignorance that the synthetic lube threads bring out.
Syn's are not magical mystery fluids that are smuggled out of the deep, dark Congo. Manuf's use them deliberately to get higher MPG's.
They are in fact required for warranty coverage in some circumstances.
Changing the lube in the rear dif, tranny and engine will free up lost power by reducing friction.
It is very simple physics and requires no smarty-pants-pie-in-the-sky-the-cow-jumped-over-the-moon-I've-never-used-them-because-they-don't-work comments.
I could have documented my results with dyno baselines and after mod runs too.
Do you know why I didn't?
SOME people just refuse to believe that they wrong or incorrect or mistaken.

"If there were any facts, it's not going to apply to a 10 ton RV"
Really?
The laws of physics apply to every known thing in the entire known universe from the atomic to the supermassive - except for 10 ton motorhomes...
Hmmm...
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Old 10-20-2012, 03:22 PM   #12
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Quote:
Originally Posted by IWillRVToo

"If there were any facts, it's not going to apply to a 10 ton RV"
Really?
The laws of physics apply to every known thing in the entire known universe from the atomic to the supermassive - except for 10 ton motorhomes...
Hmmm...
I guessing you read what you what to read. The OP ask for documentation for proof that mpg can be increased using synthetic motor oil because he wants to achive a 5% increase in his motorhome. If you think doing that will achive his goals, then tell him that, instead of beating up responders.

I use synthetics in all my machinery. Not for mpg, but for the fact that the lubricating properties don't brake down like dino oils. Therefore I change it much less often. I certainly conceed some synthetics can be "slipperier" than some dinos, which of course will reduce friction a minute amount. Therefore can affect mpg, but not in a measureable way in the real world with a MH. A 3 mph head or tail wind will affect mpg more than any engine oil will. Just MHO from someone who only got a C in physics. My real bag is quantum mechcanics.
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Old 10-20-2012, 06:22 PM   #13
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So far no documentation...No surprise...
Dino's have improved drastically in recent years.
Ford requires 3000 mile oil changes in RV's. Extended oil changes using synthetics at 2-3 times the cost still don't make sense to me. I get cleaner oil more often.
Please, some MPG improvement facts! Thanks
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Old 10-20-2012, 06:35 PM   #14
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Just use Dino oil and call it... you have already made up your mind that dino is as good as synth, so just let it be.
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