[Update] Marvel Mystery oil and fuel economy

Page 1 of 2  
I filled up this morning. Calculated mileage rose to 26.05mpg. I changed out the primary and secondary fuel filters about a week ago. This next tank will be the one that has the new filters exclusively. Also have
changed out the air filter, so the beast breaths a little freer now. Tire pressure checked this morning as added measure of reducing varibles.
--
Cheers, Kurt ('87 300SDL daily driver)

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Ah but in fact you have several variables. new fuel filters and air filter. So how do you know which one might be the reason for increased mpg if you in fact see an increase?
Paul
--
Paul Hoffman
Burlington ON
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Paul Hoffman wrote:

And then there's the - not so unlikely - effect of this whole experiment on the brain that controls your right foot...
Let's make it a double blind test. We prepare 12 anonymous cannisters of oil, 6 with product X and 6 with product Y. Another person changes your oil monthly and seals the filling cap. You record the usage meticulously. After twelve months we unvail the cannister content, pump the data into SPSS and see if there's a correlation with the oil type.
Too complicated I guess ;)
Ximinez
--
Our three weapons are fear, surprise, and ruthless efficiency...
and an almost fanatical devotion to the Pope....
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Tue, 02 Oct 2007 09:40:49 +0200, The Spanish Inquisition wrote:

Occam's razor perhaps? There have now been two tanks of MMO treated fuel run thru the system. One with old filters, one with old filters for about half the tank. Now I have new filters, primary and secondary installed with a fresh tankful of adulterated fuel.

Overall I tend to be a relatively sedate driver. The noticed increased "pep" in the response to the depression of the foot feed pedal may well play a role in the fuel consumption. But I don't tend to "jackrabbit" off from full stops and generally cruise at 55-58mph on the roadways that I most often travel.

Yep. You gonna set this up as ANOVA or are we gonna just use Chi-Square? Multiple trials in multiple locations with multiple drivers?
<BEG>
--
Cheers, Kurt

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Altitude, don't forget altitude
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Wed, 03 Oct 2007 17:56:12 -0400, me wrote:

Altitude or attitude? <G> Both may play roles.
--
Cheers, Kurt

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Guys... it is not just about filter and air filter... we know from our past experience that changing these two accounts for some change... but not in such a dramatic change.
On my car, everything was running for a year before I started trying out MMO... On this MMO full tank plus Startron at half tank... I have driven 446 miles and I still have over 1/4 tank left... more like 5/16 tank left. My tank is 23 gallons total and 3 gallons reserve. My driving is strictly local driving. My town is pretty hilly.
As I drive, I am not trying to minipulate... by accelerating as slow as possible or anything like that. I do however coast as much as I can... but not rediculously either. For example, I see red light ahead and I am driving 45 MPH... I would coast for 1/2 mile into the intersection... there is no point to keep foot on gas until light and then slam on brake.
My average MPG around town for 2 years is 25 or 26 MPG... below my 27/35 EPA rating. When I first got it, I was getting 30MPG average but didn't last for some reason... I think Algae is a huge reason on my car even though the 2 fuel filters shows zero black algae or black anything at all.
Now I am getting over 32MPG around town when I usually get 25 or 26. I get 29 MPG when I spend $9 on diesel fuel injection cleaner two separate time but then drops back to 25 when tank is finished.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
--
"Tiger" typed in part
> Guys... it is not just about filter and air filter... we know from our
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Absolutely! We don't know if it is working by design, or working by accident.
"The least questioned assumptions are often the most questionable
-Paul Broca
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Hey Tiger, I am getting about 5 mpg more with my 240D now.,. and the 300SD actually "chirped" its meaty 195.70/14s the other day! Thanks for the idea. Rob
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
As a Six Sigma Blackbelt, changing more than one variable in an UNCONTROLLED fashion can mask the effects of the primary variables and their interactions. If you'd like, I can construct a legitimate Design Of Experiment including all variables you believe might be affecting your mileage, and then you could try them one by one...
-- Message posted using http://www.talkaboutautos.com/group/alt.auto.mercedes / More information at http://www.talkaboutautos.com/faq.html
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
tweaks wrote:

_____ I fully concur with this advice. There are, unfortunately, a number of environmental variables, many of which are not measured. For example, i just completed a 1,000 km round trip through parts of the BC coast mountains. On the way to my destination i got 13.1 km/l, while on the way back it was only 11.5 km/l! The major differences were air temperature, routing, vehicle speed and air speed/direction.
The variables that play a role are: - elevation, - average grades of hills/passes (1,400 m to 1,750 m), - ambient temperature, - air humidity, - average traveling speed, - percentage of time spent in which gear (city vs highway), - tire inflation, - number of passengers, - wind speed, - type of road surface, - state/condition of engine (air/fuel filters, injectors, compression, coolant temperature), - amount of fuel taken at refill (not consistent), and - fuel (type/quality).
There are indeed well known standards for "Design of Experiments" that aim to determine all the variables that will affect fuel consumption. This is not a trivial undertaking, and requires a fairly large number of vehicles to take part in order to get a statistically significant result. In addition, all measurable variables _must_ be measured all of the time during the tests. As a result, these tests are essentially impractical to carry out by laypeople.
The best way to determine the efficacy of any fuel additive (such as MMO) is to run the car(s) on a calibrated dynamometer under precisely controlled conditions on a tank of "standard" petro diesel fuel, then refuel with exactly the same amount containing the prescribed amount of MMO. This is quite feasible, but costs a good deal of money.
Incidentally, i checked out the Walmart store where in live in BC, and MMO is simply not available. There were two brands of "injector cleaner" claiming better engine performance after use. Personally i am suspicious of fuel additives. The oil refiners who produce these fuels are the experts in the area of additives. If the supplemental fuel additives were really needed, then they would already be present in the fuel at the pump. Finally, due to the lower sulphur level in current Canadian (and US) diesel fuels, a number of injection pump failures have been reported. Apparently the rotating vane pump designs are more sensitive to lower fuel lubricity. The older piston style pumps (as found on 300SD and 300D Turbo engines) do not seem as sensitive. Despite this, i add about one cup of ATF per tank refill to make sure that the petro diesel is slippery enough for the pump to keep working properly. This recommendation comes from my Mercedes Specialists in town. Lack of lubricity in the fuel is _not_ an issue when you use biodiesel or some blend of neat vegetable oil.
--
Regards / JCH

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
You can get it here...
http://www.marvelmysteryoil.com/main.taf?p=7
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
jch wrote:

Veggie oil for the win! :)
It's amazing how much smoother my car runs on the stuff, but it does come at a slight cost of power. Not that 77hp was much to start with, but my climb of the hill away from work at night is an exercise in frustration for those who get stuck behind me...
Since going to VO I've noticed one thing for certain; I'm saving a lot of money on fuel. :)
-tom!
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Tue, 02 Oct 2007 12:43:53 -0400, Tiger wrote:
[...]

[...]
I'll pick up some Starton over the weekend. I can get it locally (within 25 mi radius) just don't often go in that direction.
I have noted, anecdotally, that the idle sounds made my the SDL seem to be less sharply pitched knocking.
I'm all for being a techical geek, but this is not exactly rocket science. The results thus far are encouraging, but not definetive by any means. Running a cleaner fuel system can not do anything but help. And it surely has added to my motoring enjoyment!
--
Cheers, Kurt

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Tiger, what car is this with such a large tank? My 300D only has about a 14 gallon tank in it.
Concerning fuel filters, when is the best time to change them. The repair manual recommends once a year, but that seems a little long to me. Is there a consensus on the interval to change this. I am referring to the main spin-on fuel filter in the engine compartment, not the pre-filter at the tank.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
--
"DougS" asked

> Tiger, what car is this with such a large tank? My 300D only has about
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
My car is a 1995 E300D... yes, it got a monster tank. It is practically the same tank as my old 380SE... about 24 gallon total with reserve.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Wed, 03 Oct 2007 18:46:34 -0400, Tiger wrote:

And my '87 300SDL has a 25 gallon tank. Gulp.
--
Cheers, Kurt

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
There is a WVO kit out there that adds another 20 gallons tank to the car... for a total of 44 gallons! Unthinkable...
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Related Threads

    Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.