After a bottle of Stanadyne my 09 mileage drops

Jettawolfs98 · Dec 16, 2009

Quick Question:

After using a bottle of Stanadyne on a full tank of diesel on my 09 jetta with 7k miles the mileage is really crappy only 150 miles pn the half tank mark and the engine sounds like running high but i have to say that i put
the whole 16 oz bottles by mistake.

So not sure if that's the issue, I wonder if anybody else had this issue before.

The Stanadyne bittle shows "Formulated for ULS"

Im thinking the mix is to rich on Stanadyne since is the first time using it on the 09, I was using it on the 02 TDI with no issues.

Any light on this issue.

Thanks

Julio

Omaha is being very cold for the last 2 weeks that's why i'm using it .

lupin..the..3rd · Dec 16, 2009

Jettawolfs98 said:
but i have to say that i put
the whole 16 oz bottles by mistake.
...
So not sure if that's the issue,

Yes. 4 ozs per 15 gallons for the regular stanadyne, and 2 ozs per 15 gallons for the "winter 1000" product is the correct quantity.

Jettawolfs98 · Dec 16, 2009

lupin..the..3rd said:
Yes. 4 ozs per 15 gallons for the regular stanadyne, and 2 ozs per 15 gallons for the "winter 1000" product is the correct quantity.

Wow so I put a lot lot more than the normal ratio.

Mmmhhhh should I fill the tank again to lower the ratio?

I hope the engine is not having future issues because of this.

Thanks for your input.

Mach1 · Dec 16, 2009

I would lean it out, I would say you got a #1 fuel fill up, thats why the fuel mileage took a dump, hopefully its not related to the super tune up you did with the fuel.

Jettawolfs98 · Dec 16, 2009

What could be the consecuences of either one?

lupin..the..3rd · Dec 16, 2009

Jettawolfs98 said:
What could be the consecuences of either one?

Why don't you finish burning through this tank, then fill up with a proper tank of #2 diesel with no additives. Then you can tell us.

GetMore · Dec 16, 2009

I would not be concerned. I don't see it causing any damage.

dzcad90 · Dec 16, 2009

Going excess on the additive should have no harmful effect, except for emptying your wallet just a little bit faster

It is possible that with it starting to get colder in the midwest, the blends of fuel you are getting are either starting to be winterized, or being winterized "more.", meaning less thermal content per gallon which directly translates into less MPG.

I wouldn't sweat it and drive on and see how it goes. I wouldn't be surprised if you notice the lower MPG for the rest of the cold season.

Jettawolfs98 · Dec 17, 2009

I went to another gas station and filled the tank again, feels like the car is back to normal and from the gas station to our house the car ran fine.

I know that during the winter we loose a couple of mpg.

Since our drive is not very long every day only 40 miles both ways our mpg is the normal 38 to 40 mpg, which is fine for us.

MyAvocation · Dec 17, 2009

Jettawolfs98 said:
Since our drive is not very long every day only 40 niles both ways our mpg is the normal 38 to 40 mpg, which is fine for us.

x2 what dzcad90 said... If my geography is correct, you had a few days of extreme temps last week. And during a 20 mile commute it's likely the motor never reached full operating temp. I drive a 33 mile commute with 80% expressway and still can't get the motor to full temp when ambient is single digits -- and the difference in MPG is substantial.

DoctorDawg · Dec 17, 2009

I personally have no data to substantiate this, but I know it is a long-standing 'received wisdom' that you really can't use too much additive (in terms of hurting anything). One of these days somebody needs to confirm this by filling up with Stanadyne (ka-chingg!). It's mostly diesel, anyway.

leicaman · Dec 17, 2009

Gee you'd only have to buy about 337 bottles. A nice over grand fill...

Dusty Sidewinds · Dec 17, 2009

I have been told that there is in fact a down side to adding too much Stanadine to your fuel. It will produce small droplets of asphaltane in the fuel and enough of them can begin to clog the fuel filter. Asphaltane is asphalt or tar.

No other negatives that I'm aware of.

DoctorDawg · Dec 17, 2009

leicaman said:
Gee you'd only have to buy about 337 bottles. A nice over grand fill...

Yeah, but think of the mileage, man!

MayorDJQ · Dec 17, 2009

Jettawolfs98 said:
mileage is really crappy only 150 miles pn the half tank mark

Half tank is ~7 gallons, so you're getting ~20mpg? 16oz of Stanadyne isn't going to cause this drop: something else is going on.

Are you doing a lot of stop & go driving? Do you have a consistent method for filling? Diesel foams a lot, if you just put the nozzle in and fill at full blast, you'll have 7/8 tank of fuel and 1/8 tank of foam.

Jettawolfs98 · Dec 18, 2009

MayorDJQ said:
Half tank is ~7 gallons, so you're getting ~20mpg? 16oz of Stanadyne isn't going to cause this drop: something else is going on.

Are you doing a lot of stop & go driving? Do you have a consistent method for filling? Diesel foams a lot, if you just put the nozzle in and fill at full blast, you'll have 7/8 tank of fuel and 1/8 tank of foam.

After re-fueling in another gas station the problem went away so I guess a bad batch of diesel was the guilty of the weird act.

rotorhead23 · Dec 20, 2009

If you ask VW they tell you DO NOT use any additives in the new 2 litre TDI. My dealers mechanics say the same thing. I believe you can cause damage in the exhaust system, not so much the engine. This goes for Stanadyne.

securityguy · Dec 20, 2009

I think that's a lot of poppycock

There are many additives available that are just fine for the new 2.0 that are specifically made for use with ULSD. What do you think a VW mechanic is going to say if it says not to use it in the book

It's just a CYA so they say I told you not to use it

There are way to many people using additives for many miles with no adverse effect...just be prudent in making your decision of which additive to use. Stanadyne, PowerService, Opti-Lube and many others will be just fine. I agree that the main reason they want to be cautious is due to the emissions system and has NOTHING to do with the engine itself. Buy the RIGHT additive and use it as directed and you should be fine.

Dive more...worry less

tdiatlast · Dec 20, 2009

Gee...VW and other manufacturers ask for a diesel fuel lubricity "scuff rating" (HFRR) of 460. (lower is better) EPA, thumbing their collective noses at the manufacturers request, mandates all US diesel fuels have a minimum scuff rating of 520. (EU diesel is in the low 400s.)

Opti-Lube XPD lowers the scuff rating to 317, Stanadyne 479. Both are ULSD compliant.

I know which additive I'm going to be using.

DoctorDawg · Dec 21, 2009

tdiatlast said:
Opti-Lube XPD lowers the scuff rating to 317, Stanadyne 479. Both are ULSD compliant. I know which additive I'm going to be using.

Has off-the-shelf (i.e., commercially released) Opti-Lube been independently tested yet? The only report I've seen was a test on a sample provided by the manufacturer before it was available for sale. Lord only knows if they're selling the same stuff that was tested back then.

securityguy · Dec 21, 2009

Doctor...your point is spot on and until someone does a new test, we will never know. One can only assume that they are one in the same until a new test proves differently. If the manufacturer is a person of high integrity, then we all have nothing to be concerned about

Plus 3 Golfer · Dec 21, 2009

rotorhead23 said:
If you ask VW they tell you DO NOT use any additives in the new 2 litre TDI. My dealers mechanics say the same thing. I believe you can cause damage in the exhaust system, not so much the engine. This goes for Stanadyne.

Do you have a written response from VW telling you not to use additives in the 2.0 TDI? Please ask your dealer mechanic for documentation from VW to back up his statements.

tdiatlast · Dec 21, 2009

DD,
Does this study (August 2007) have any value, in your estimation? They state that the study was paid for by the manufacturers of the additives, except for Amsoil and PowerService, who chose not to participate. They were included in the comparison, paid for by "diesel enthusiasts".

http://www.johnfjensen.com/Diesel_fuel_additive_test.pdf

Turbine Suburban · Dec 21, 2009

Plus 3 Golfer said:
Do you have a written response from VW telling you not to use additives in the 2.0 TDI? Please ask your dealer mechanic for documentation from VW to back up his statements.

Actually, the service manual recommends standyne in section 20-4 for fuel gelling.

dweisel · Dec 21, 2009

Turbine, good find. Sometimes a couple of drinks can make you see a little more clearly.

Dweisel

Jettawolfs98 · Dec 27, 2009

Nothing more clear than that statement "Sometimes a couple of drinks can make you see a little more clearly"

After a bottle of Stanadyne my 09 mileage drops

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