4 Bottles of Stanadyne 38564 Performance Formula 8 oz Diesel Fuel Additive

The Stanadyne 38564 Performance Formula Diesel Fuel Additive is an absolute game-changer! This additive has significantly enhanced my diesel engine's performance. With just 8 ounces per bottle, it effectively boosts fuel efficiency and engine power. The difference in engine smoothness and reduced emissions is remarkable. A must-have for any diesel vehicle owner seeking improved performance and longevity for their engine!

I add a little with every fill up. I can tell when i forget to add it. I have a dodge 3500 that is 24 years old. This stuff works great for start ups and keeps the truck running great.

Worked as expected.

A great fuel additive for diesel engines. I noticed a significant difference in how smooth the engine idles and runs when using this additive. I would have given it 5 stars if the containers had ounces markings on them. I typically fill my tank when it reaches 1/2 empty and therefore I only need 4 ounces. It would be nice if the 8oz bottles (actually, all container sizes) had a translucent fluid level indicator with oz markings.

I have been using this fuel additive for years and amazon has the best price.

This stuff is my favorite. My Cummins motors love it. Can really tell a difference when I don’t use it. The 4 pack is handy, and priced right.

Great product and can’t use too much in diesel. Awesome for pumps.ask any diesel shop.

Not sure if it's a placebo effect or not, but I've been using this with every fill-up on my 2011 Ford 6.7 diesel (the model with the sensitive fuel pump) for ~20K miles. No pump failures.