Does anyone completely change out their steering fluid after x number of years? My boat is 20 years old, steering is fine, but I just read a couple articles that recommend changing out the hydraulic fluid (marine) every 5 years or so. I'm going to do mine this fall anyway, because it's NEVER been done, but just wondered what might be the norm?? And at that point should I go all in and replace whatever "seals" there are, even if nothing is wrong?