They last a long time, and break at anytime. Depends on were you live how much you drive. Hot climates and hard driving will make for more frequent changes necessary. I just finished changing all the hoses on my 91 and did not find any that were ready to go. The Dos Amigos in the engine compartment showed the most deterioration (softness). The main problem is if you loose a hose on the X you end up on the side of the road waiting for a flat bed, hoping you did not damage the engine.