Step 7: Final thoughts and considerations.
2. I am pretty sure that the rubber in a heater hose will not stand up to super long term exposure to petroleum products (that's why we don't use radiator hoses for gas tank filler necks). However, this will keep grease in and protect the joint from foreign matter. I believe that it should last quite a while.
3. Remember to routinely inspect your entire vehicle for safety and keep the rubber side down!