Stanadyne Diesel Performance Formula 38566, 64 Ounce

on time

I have been using this product many years in all of my tractors and other diesel equipment and never had a fuel related issue Was getting harder to find it locally and was glad to find it on Amazon

This works really good in winter sub 10° temps in central KY in my 2022 Duramax 2500. I've been using this for 2 years now complaints!!

My mechanic said to avoid biodiesel, and use Stanadyne with every fill up. So I always do. Sometimes I get fuel that's part biodiesel. I had to get my EGR valve replaced a few years ago, as did the previous owner. But my 2005.5 Jetta TDI is running great now.

Does the cleaning job well

Stanadyne does not provide the results of HFRR results for this additive. Contacted them HFRR data - they answered that they outsourced additives to a different company (Parker Hannifin) and I should contact them. In my opinion if you name is on the bottle you should now stuff about it, or redirect the request accordingly, not to football people. According to Spicer Report on lubricity improvement additives this additive makes a tiny improvement: -33µm for values 350-400µm. Under 10%.Did not see data for cetane improvement.Bought lubricity formula from Opti Lube, will probably switch to them for Performance formula too. But not a bad product per se.

I noticed a significant difference in the smoothness of my diesel engine idle and performance when using this additive. Buying in this bulk sizing is also a great way to save money. My only complaint - I have to carry a graduated cup / beaker to measure correct dosage amounts. It would be nice if the container had an ounces marking on the container.

Always curious how people give reviews on preventative products. I have had my Audi A7 TDI for 50k miles before I started using this at 110k and it always had a rough stop. After using 4oz per fill for 8-10 (5k miles) tanks I have noticed it now shuts down smoother. I am fairly certain this product is why. Personally I purchase the 64oz bottle and then put 8oz in a small juice bottle and keep it under the hood for two tanks making it much more cost effective. I plan to keep using this product.