I just had mine replaced in my Mercury 115hp OPTIMAX 2-stroke and was told that this needs to be done once a year. I find this hard to believe that Mercury would use a part that has to be replaced every year. Does anyone on here, or maybe a Mercury rep that reads this board, know if Mercury is looking into this or do they just don't care about the customer and are content with using this product? Am I wrong to think this, is this normal for boat motors?