Best diesel treatment?

[Jon]

We filled in Florida once and then headed back home. We encountered -21F when we stopped for the night in WV, and in the morning it had dropped to -26F.

No additives, never gelled. Ran on high idle all night long. 8V92.

[luvrbus]

The older DD will return a lot of warm fuel back to the tank not near as hot as the newer engines back when the sold real gasoline all we ever used was a gal of unleaded gasoline in 50 gals of diesel no way would I do that now with today's gasoline 

[OneLapper]

I think we covered this here a year or so ago, but I used Stanadyne when I was able to get it at wholesale prices.  On my TDI it would improve the mileage by 10%, approx 4 mpg.  I never used it in the bus, but it should improve power, mpg, etc by the same percentage.  The problem is the price.  When I was buying it wholesale it was cheap and it paid for itself, but the prices went up.

[Oonrahnjay]

I think we covered this here a year or so ago, but I used Stanadyne when I was able to get it at wholesale prices.  On my TDI it would improve the mileage by 10%, approx 4 mpg.  I never used it in the bus, but it should improve power, mpg, etc by the same percentage.  The problem is the price.  When I was buying it wholesale it was cheap and it paid for itself, but the prices went up.

      I have used (mostly) Power Service - grey bottle in the summer and white in the winter - in my 350K miles TDI every time I've filled it.  I think it's good for mileage and keeps wear down.  Those Bosch VE fuel injection pumps and injectors are pretty precision-made -- maybe extra lube in the fuel isn't needed on a big bus engine, especially a 20-30-40 year-old one.  (The Bosch pumps/injectors depend on the fuel for lubrication; I'm pretty sure that N American pickups -- Powerstrokes, etc. -- lube at least parts of the injection pump with engine oil.  That a very different ball game.)

[OneLapper]

      I have used (mostly) Power Service - grey bottle in the summer and white in the winter - in my 350K miles TDI every time I've filled it.  I think it's good for mileage and keeps wear down.  Those Bosch VE fuel injection pumps and injectors are pretty precision-made -- maybe extra lube in the fuel isn't needed on a big bus engine, especially a 20-30-40 year-old one.  (The Bosch pumps/injectors depend on the fuel for lubrication; I'm pretty sure that N American pickups -- Powerstrokes, etc. -- lube at least parts of the injection pump with engine oil.  That a very different ball game.)

The Stanadyne is a cetane booster and adds lubricity that the ULS removed. They also make a winter formula.

I agree, I have no idea if it would really make much of a difference in, say, my 8V71.  I think that thing will run on most anything!  But my TDI  (AHL engine) has 497k on it and it still runs great.  I replaced the injectors at 385k with euro spec DLC tipped injectors, those alone bumped the mileage from an average of 45 to 49mpg.  With a cetane booster I can get low 50s.

[Oonrahnjay]

The Stanadyne is a cetane booster and adds lubricity that the ULS removed. They also make a winter formula.

I agree, I have no idea if it would really make much of a difference in, say, my 8V71.  I think that thing will run on most anything!  But my TDI  (AHL engine) has 497k on it and it still runs great.  I replaced the injectors at 385k with euro spec DLC tipped injectors, those alone bumped the mileage from an average of 45 to 49mpg.  With a cetane booster I can get low 50s. 

      Yeah, "Power Service" is the same (heavy on the cetane booster in the summer mix, anti-gel in the winter formula).  It probably has the same ingredients as Stanadyne but -- in my limited experience with the Standadyne -- it seems to be a little lighter on the positive effects on mileage compared to the Stanadyne.  The Power Service has done me really well on the lubrication but the Stanadyne just seems a little better.  The only problem is that it's super rare around here and it's much more expensive than Power Service if I can find it. 
      I don't think I've ever run a tank in my TDI's without it (mine's an ALH, too) and I don't intend to.  I wonder if it will benefit the Cummins going in my bus?