Stanadyne Performance Formula Diesel Fuel Additive - Pack of 8 Pint Bottles - Part # 385658

it helps keep fuel clean and improves performance / milage

Stanadyne is the BEST diesel fuel on the market! I've tried them all and Stanadyne is by far a superior product. It makes my 2004 Duramax run extremely well!

I read a lot of reviews stating that the mileage would increase, wasn't the case for me. My truck does run quieter and smoother and that is more important to me than adding a mile per gallon.Overall pleased.

Ordered 8 and received two bags with 2ea for a total of 4ea so paid for 8 but got 4. Have sent message and no reply so leaving a message since seemingly no other recourse!

Have used it for years good product

I'm no chemist or automotive expert, but this product seems to work on my '03 F250 6.0 diesel. Going beyond the gremlins that were born within this engine (Ford you should be ashamed) this product does what it claims. I find easier starts, less engine noise, slight increase in MPG and a bit of confidence that the fuel is being enhanced. Since I plan on driving this one into the ground, every bit of help is appreciated. BTW- if you are willing to invest about $5K into a 6.0 you can go a long ways past the initial problems. Approaching 200K and I have seen 20 mpg on a perfect day. Yes, really.

Stanadyne saves fuel and makes my GMC run better.

It works like a champ and calmed my 7.3 down and added hp at the same time! Purrs like a kitten.