Not anti-gel additives.

Probably 75-80% of the time I fill up with Shell Premium diesel. Actually, the Shell Premium is cheaper than the regular diesel found at the next few closest stations.


AND I use Stanadyne Performance Formula at every fill-up.


The kicker is there is no noteworthy difference in power, economy, or engine noise with either. (I have only in the last couple of thousand miles started using the additive.) Like I said the "premium" is cheaper and that is where I usually fill up. I do not feel like I'm throwing my money away on the additive because my primary concern is lubricity.


So I guess there is no instantaneous gratification here, but I can still hope I'm doing the right thing. Edited by: T-Rex

I've never seen an MPG increase when filling up at a station with fuel labeled "premium". It's not unusual for me to run a tankful of fuel through my truck in a single day, so I've tried different stations for a week or so in hopes of finding an MPG advantage, but never have. I'm sure there are some stations out there that sell fuel that will give you a fuel mileage increase. I just haven't personally found one.

I have noticed a .75 to 1 MPG increase since having a 500 gallon tank of BP diesel supreme installed here at my house, so if your lucky enough to have access to it, I highly recommend it.

I've never noticed any difference in mileage or power when using Stanadyne or FPPF (I never have found any Primrose), but like T-Rex says, my intent was to improve lubricity.

Please check out www.schaefferoil.com (http://www.schaefferoil.com) td sheet 137nd diesel treat 2000. Tell me what you think. I guarentee Semi Fleets a 4% mpg increase. I am considering running a couple of member specials. One being this product by the gallon. It offers a lot of benefits in one package at a great value. There is a winterized version as well.Edited by: salesrep

I have been using it off and on for some time now...

I have been using it off and on for some time now...

and........... ???

I just wanted to say that the last couple tankfulls I've been adding Marvel Mystery Oil and I'd swear that the ol' girl has been idling quiter, with a lot less of the diesel rattle.


Could be just my imagination though.http://www.dieselplace.com/forum/smileys/HiHi.gif


At any rate, most of the time I run without any additive. Last winter I ran a lot of FPPF cuz it went on sale at our local farm store, but I didn't notice any changes in idle noise or MPG. Mostly decided to try the Marvel oil a couple weeks ago for "lubricity" reasons (and because it also went on sale at our local farm store), and didn't expect to notice any changes. So the reduction in idle rattling is quite a pleasant suprise.


Now that it's idling SO MUCH MORE QUIETLY (I'm still not sure it's just my imagination) today I went and replaced the muffler with a straight pipe (never had a cat either), and I'm amazed at how tame it sounds. But this is my first diesel, so I don't have anything to compare it to.Edited by: w_huisman

Been useing stanadyne p/f since about 4000 miles, I noticed a small performance gain right away. So I voted hp increase, it was there but not huge like I believe some people may be looking for.

I have no doubt that the Schaeffer 137ND is a fine product, especially if it indeed exceeds the John Deere formula, which I have read is excellent.


I take it that the 137ND is an emulsifier.


A 4% increase in economy is notable--that would be between 15 & 20 additional miles per tank-full for me. That would be the difference between how I drive and how my wife drives--she's got the lead foot.


I believe that 137ND is heavier than Stanadyne's Performance Formula, which may explain why the 137ND treats at 2000:1 and the Performance Formula treats at 500-1000:1. Stanadyne is closer to the specific gravity of low-sulfur diesel.


As a side note I carry a little box of latex gloves for fueling and handling these additives because they are nasty stuff. Most diesel pumps at the stations are no less nasty and I'm not interested in contaminating my family with it or stinking up our going on $50K-plus truck.http://www.dieselplace.com/forum/smileys/Ermm.gif

Diesel treat 2000 is an emulsifier that also has the chemistry to de-emulsify when excess amounts of water are present.


Also available in pint bottles that treat 125 gallons.

Sales Rep


Why don't you start paying freight, you may get more sales.


Genohttp://www.dieselplace.com/forum/smileys/Hug.gif

I am to making schaeffers products very affordable to forum members. Wholesale cost free shipping orders over $250. Orders under $250 are still less( sometimes a lot less) than competitive products off the shelf after shipping charges.Edited by: salesrep