I never had good luck with the stanadyne, and i used alot of it; 5 gallons in about 6 months. Too much for poor performance, and it smoked alot too (comparitively), just did not seem to keep the injectors clean. Could be the local fuel i was using it with. Power service was a worse performer than the stanadyne, the redline has been the best sofar, and ive used diesel power, diesel purge, dfc plus, fppf, howes, marvel, 2-stroke, etc....