I have an 89 GMC 1500 Vandura that I bought 6 years ago with a massive power steering leak. After trying three or four of the other brands stop leak, my brother-in-law suggested that I try Lucas power steering stop leak. It almost immediately stopped the leak. Till this day it has not leaked for almost 6 years & I still have the rest of the bottle. The fluid level is still on full! I'm sold on the Lucas name, David Kana