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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 02-11-2013, 08:43 PM   #1
rudycoop
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Has anyone ever mixed 2 stroke in their gas?

There is a forum w 51 pages of responses talking about using 2 stroke in your fuel tank. Mixing 1 ounce of 2 stroke per 5 gallons of gas. It supposedly does a whole lot of good.

lubricates the fuel pump/seals/injectors.
cleans the fuel system and scavenge water that ethanol attracts.
Creates a film of protection in our fuel system to stop corrosion.
Acts as a cleaner for our spark plugs/valves/combustion chambers.
Cleans the ring packs
Leaves a film on the cylinder walls to eliminate cold start metal wear.

Afterwards you will be
A) Run Smoother B) Run more efficiently C) Parts will last longer i.e. fuel pumps/injectors etc. D) Should see more RWHP and MPG

For pennies!

I used this on numerous vehicles and have recently been doing it on my 325i. Every fill up I measure it out and dump it right in with the gas.

Curious is anyone else has done this?
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Old 02-11-2013, 08:45 PM   #2
wildirish317
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Not me.
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Old 02-11-2013, 08:45 PM   #3
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makes sense
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Old 02-11-2013, 08:50 PM   #4
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Nope, never done that.
Can't see how a lot of those points would be valid, given that all you are doing essentially is putting oil in the gas.
For example I cannot see how adding oil to the fuel would do anything for water in the tank. The two don't mix. Oil+anything generally does not equal clean.
I'd also be curious to see what effect, if any, this could have on sensors and cats.
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Old 02-11-2013, 08:53 PM   #5
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Quote:
Originally Posted by rudycoop View Post
There is a forum w 51 pages of responses talking about using 2 stroke in your fuel tank. Mixing 1 ounce of 2 stroke per 5 gallons of gas. It supposedly does a whole lot of good.

lubricates the fuel pump/seals/injectors.
cleans the fuel system and scavenge water that ethanol attracts.
Creates a film of protection in our fuel system to stop corrosion.
Acts as a cleaner for our spark plugs/valves/combustion chambers.
Cleans the ring packs
Leaves a film on the cylinder walls to eliminate cold start metal wear.

Afterwards you will be
A) Run Smoother B) Run more efficiently C) Parts will last longer i.e. fuel pumps/injectors etc. D) Should see more RWHP and MPG

For pennies!

I used this on numerous vehicles and have recently been doing it on my 325i. Every fill up I measure it out and dump it right in with the gas.

Curious is anyone else has done this?
Okay, in before WDE46 and DonaldE, among other engineers. A few questions:

cleans the fuel system and scavenge water that ethanol attracts
I used to use gasoline to clean up oil residue, not the opposite. Since when does oil absorb water?

Leaves a film on the cylinder walls to eliminate cold start metal wear
Isn't that what motor oil is for?
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Old 02-11-2013, 08:54 PM   #6
jgold47
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most e46 owners already do this. Its called burning oil.

I mix a little milk in with my gas. Usually skim, but sometimes 2%. I figure it does a body good. I've never had a car rust on me and I live in Michigan.
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Old 02-11-2013, 08:57 PM   #7
peytonracer4
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putting oil in the gas...? seems like it would just make combustion weird and unpredictable.

it would also foul the plugs.

and it will screw your cats
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Last edited by peytonracer4; 02-11-2013 at 09:07 PM.
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Old 02-11-2013, 08:57 PM   #8
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Originally Posted by rudycoop View Post
Should see more RWHP and MPG
And I forgot to include the statement that caused me to respond in the first place. Does 2 cycle oil have a higher btu/lb content than gasoline? If that's the case, why don't we run our engines on it to begin with? How much btu does it add to a tank of gas? How much does it cost per gallon?
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Old 02-11-2013, 09:03 PM   #9
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And while you're at it op, make sure to replace your muffler with that of a lawnmowers; they're said to have a more free-flowing muffler.
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Old 02-11-2013, 09:06 PM   #10
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I will put what I have left from a day of riding my dirtbike in my van it doesn't hurt it but I wouldn't waste money on it on my car
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Old 02-11-2013, 09:12 PM   #11
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I also suggest installing a 48 inch John Deere deck to save wear on your lawn mower while you are at it.

Last edited by Brevik; 02-11-2013 at 09:13 PM.
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Old 02-11-2013, 09:15 PM   #12
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I also suggest installing a 48 inch John Deere deck to save wear on your lawn mower while you are at it.
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Old 02-11-2013, 09:23 PM   #13
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Quote:
Originally Posted by rudycoop View Post
There is a forum w 51 pages of responses talking about using 2 stroke in your fuel tank. Mixing 1 ounce of 2 stroke per 5 gallons of gas. It supposedly does a whole lot of good.

lubricates the fuel pump/seals/injectors.
cleans the fuel system and scavenge water that ethanol attracts.
Creates a film of protection in our fuel system to stop corrosion.
Acts as a cleaner for our spark plugs/valves/combustion chambers.
Cleans the ring packs
Leaves a film on the cylinder walls to eliminate cold start metal wear.

Afterwards you will be
A) Run Smoother B) Run more efficiently C) Parts will last longer i.e. fuel pumps/injectors etc. D) Should see more RWHP and MPG

For pennies!

I used this on numerous vehicles and have recently been doing it on my 325i. Every fill up I measure it out and dump it right in with the gas.

Curious is anyone else has done this?
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Old 02-11-2013, 09:31 PM   #14
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When I was two years old, my parents bought me a Suzuki jr50 w/custom fab training wheels

It was 2 stroke.
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Old 02-11-2013, 09:37 PM   #15
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What do we have, scooter motors? I remember a scooter I had that I had to mix 2cycle oil with the gas to make it work, but not on my bimmer you crazy.
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Old 02-11-2013, 09:39 PM   #16
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This isn't an RX7, and E46's already burn oil.
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Old 02-11-2013, 11:24 PM   #17
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This isn't an RX7
Shucks, came in here to say that. Sounds like a silly idea.
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Old 02-11-2013, 10:57 PM   #18
rudycoop
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It has been extensively tested on other forums and I will say it again, 51 pages of positive results. I have been doing it and my 325 runs and idles like new.

Check it out:
http://www.ls1.com/forums/f48/been-testing-91206/
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Old 02-12-2013, 06:32 AM   #19
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Quote:
Originally Posted by tmr931 View Post
makes sense
No it doesn't.

Quote:
Originally Posted by wildirish317 View Post
And I forgot to include the statement that caused me to respond in the first place. Does 2 cycle oil have a higher btu/lb content than gasoline? If that's the case, why don't we run our engines on it to begin with? How much btu does it add to a tank of gas? How much does it cost per gallon?
Actually I think it may (not btu/lb but btu/gal). The more refined a fuel is, the lower it's energy density (in general). The "density" part of that statement is important. That is a rating of megajoules per liter (or btu/gal) whereas specific energy is megajoules per kilogram (or btu/lb). Specific energy remains about the same for all oils from crude to aviation fuel (when you start adding ethanol you get killed). Energy density has a well defined downward trend. Take these densities/specific energies for example:

Type: E Density ; Specific E

Crude Oil: 37 MJ/L ; 46.3 MJ/kg
Diesel: 35.9 MJ/L ; 43.1 MJ/kg
Gasoline: 34.2 MJ/L ; 46.4 MJ/kg
E10 "Gasohol": 33.18 MJ/L ; 43.54 MJ/kg
E85 "Gasohol": 25.65 MJ/L ; 33.1 MJ/kg

2-stroke oil is going to be somewhere between crude and diesel. It is harder to combust completely and that's part of the reason 2-stroke engines have horrible emissions (apart from the less efficient cycle). The only reason 2 stroke engines have this additive is for it's primary lubrication in the crank. I'm not going to explain the 2-stroke cycle and it's method of induction/exhaust and fuel/air mixing, but it NEEDS this oil. A 4 stroke absolutely does not.

Also, you can see why E10 and E85 suck. They do burn more efficiently and a little more cleanly, but you are getting less energy per unit volume and per unit mass.

Quote:
Originally Posted by rudycoop View Post
It has been extensively tested on other forums and I will say it again, 51 pages of positive results. I have been doing it and my 325 runs and idles like new.

Check it out:
http://www.ls1.com/forums/f48/been-testing-91206/
I don't care what 51 pages of the LS1 forums say (I'm not going to waste my time reading that many pages). It probably doesn't hurt anything seriously, but there is no way this increases HP or MPG. All it's going to do is foul your plugs more quickly than pure gasoline. Who knows what it may do to your cats. As far as lubricating the fuel pump, that may be true, but the pump is designed to be adequately lubricated by gasoline. Anyway, the fuel pump failure on these cars seems to be a motor issue, not an issue with the pumping mechanism itself wearing out.

All I really have to say is that there is no need for this "additive" even if it did help. Our engines last a very long time as it is with regular oil changes. That is the only oil your engine needs. The oil system adequately lubricates the engine at all times, unless the oil pump nut comes off. In that case, some 2-stroke additive is not going to help you.

Quote:
Originally Posted by Rubenk View Post
I have heard and seen it on a few occasions where running a bit of ATF can clean things up due to all the "detergents", but I still wouldnt recommend it on a modern engine. An old carbeurated farm truck? Sure, throw whatever you want in there, but probably not the best idea on a new ride(granted that E46's arent that new anymore).
First of all, the ATF thing is a myth and that myth involves adding it to your oil, not to your gasoline.

Second, our cars may be 10 years old, but their technology matches the lower level brands made in the past few years. It's not quite as refined (VANOS problems), but BMW pioneers technology before most other car makers by several years.

Last edited by WDE46; 02-12-2013 at 06:52 AM. Reason: Auto-save 1360673525
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Old 02-12-2013, 07:01 AM   #20
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Quote:
Originally Posted by WDE46 View Post
First of all, the ATF thing is a myth and that myth involves adding it to your oil, not to your gasoline.

Second, our cars may be 10 years old, but their technology matches the lower level brands made in the past few years. It's not quite as refined (VANOS problems), but BMW pioneers technology before most other car makers by several years.
Disagree on the source of the myth, my basis for it comes from growing up with Big Rigs and farm equipment, and the fellas here tend to agree: www.steelsoldiers.com, it has held true in using it in the fuel tank of my M35A2 with a Continental Multifuel engine too.

But that is irrelevant to this discussion.
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