AR6400-D Diesel Fuel System Cleaner (12 oz) Four Pack - Rapid Injector Cleaner, Turbo & DPF Deposit Control

The DPF warning light came on in my 2014 VW Touareg TDI Lux and it was suggested that I run a tank with this product before I spend a fortune at the dealer. (To be detailed, my tank is 26 gallons, and this bottle will treat 40 gallons. So, I used 3/4 of the bottle and filled my tank. Added the remainder of the bottle and 10 more gallons of diesel when my tank was half empty.) Voila! The light went off within driving about 50 miles and has never come back on. That was a couple of years ago and I now run an Archoil tank about every 6-7 months, for good measure. The fine folks at Archoil recommend every 5,000 miles. I'm probably near that ballpark. Great stuff!

Arch oil works great on my 6.7 diesel. Cleans injectors great !!! I use a bottle after every oil change

So far after using this, I seem like the truck is getting better fuel mileage, and it running a lot smoother

1999 Volvo S70 GLT light pressure turbo, 138k. Check engine light P0234 code. Turbocharger Overboost condition. Most likely the waste gate on the turbo fouled with carbon. I am tired of working on the engine of this car. I thought I would try a bottle of Archoil cleaner. I put in the whole bottle in and filled the tank, 18 gallons. After a quarter of a tank burned the check engine light went away. And the car runs the best since I've had it. Smooth. More power and seems to be quieter too. Thumbs up. Good stuff. I'm sold.

Since the turbo doesn’t seem to be caked up and everything is working good, I guess it helps

This is a life saver. It was looking like I needed a new dpf filter. A few bottles of this product has my truck running like new and the filter stays empty. Amazing product

This product works well in my 6.7 Cummins and cleans the dpf.

Good product

My Truck was running like garbage! 2000 F-250 7.3L. Was throwing 9 engine codes, would barely start, usually wouldn't stay running, and if I tried to drive it anywhere it was an adventure, no power, could die anytime and strand you, a nightmare. So I bought this Archoil Diesel Fuel system Cleaner and Archoil9100 Friction Modifier. Expecting to be disappointed but willing to take the risk before spending big money on repairs at a garage. I dumped the products in, and tried to start the truck right away (block heater had been plugged in for hours). It was about -8C out; couldn't get the truck to run for more than 45 seconds. Did this 3 times. The next day after leaving it plugged in over night, it starts under duress, but I manage to get the rpms up to 2000 and hold them there for about 5 mins. I let the truck come back to idle and leave it idling for 30 mins. Come back outside and it's still idling, good sign, sounds good too. Decide I'll drive it 1 km down the road and see how it drives to the gas station, I needed to fill it up after all, I hadn't followed the mix instructions on the fuel system Cleaner. I baby it down the road. Fill it up. Decide to give'r a rip on the way home and it runs awesome, decide I'll rip to the next town and get a coffee, truck pulls and cruises at 120 km/h easily. 2 weeks later ish ans still running great. Also I wiped the engine codes and ran it for a few hundred kms and now only have 1 code that shows up. Awesome product.

It is good

Fantastic product to keep emission system clean and functioning properly. 280000 km and never a "check engine" light or problem. I only use this when really working my 6.7 Cummins pulling my camper over a long distance. Otherwise, I use Archoil's regular treatment with every fill up. I will continue to purchase.

Seems to help after flap code and diesel geeks fix.

Run this every 5-7k miles. Definitely notice a difference. Great stuff.