I've replaced mine twice in about 60,000 miles and it looks like it may need to be replaced again. Is this normal? It seems as though there is ALWAYS a bit of spray on the underside of the body. I never get a puddle under the Heep, but the fact that it is always a LITTLE oily back there always has me checking it out. I don't wanna run out of fluid! I can certainly understand a minute amount of fluid since that seal is the only thing holding back all of that +4...plus, it's obviously not 100% leakproof since the slip yoke is constantly spinning inside of it.