Stanadyne Diesel Performance Formula 38566, 64 Ounce

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!!

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.

Price is better than any local parts store, does the Job

Does the cleaning job well

Been using this in my gen3 Cummins since 2016 with no complaints.

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.

Good product by stanadyne.

Have used this product for many years and it works great