I have used a number of AN fittings over the years on different cars for fuel, oil and water. Aeroquip, Russel, Earls , Jegs , Summit and even E-Bay cheapy ones. Never has a problem with any of them except the red / blue fading on Summit or Jegs fittings, can't remember. The hose is where I found problems, The cheaper braided hose from the popular catalogs when cutting just flair apart. Never had a problem in the past , just in the last year. And I know how to cut and install the fittings. So in my future ,I will spend the money on good brand hose.