I use Fuel Power additive, that I buy by the gallon from a truck supply store in Orlando for a little over $50, which is a lot cheaper than buying 8 oz. bottles at truck stops. I've used FP on a variety of cars and pickup trucks, since I got my very 1st diesel in 1984, an Isuzu pickup.
My original Volvo truck w/ Volvo engine had 538,000 miles on it when I got it 5+ years ago, and I've used Fuel Power since then up to the 1,066,000 miles when I traded it in, and NEVER needed any work on injector pump or fuel injectors during all those miles. :clap: