I checked my power steering fluid today and it was significantly low. The level in the translucent plastic reservoir was well below the "minimum" line and it took about 6 oz. (half a bottle) to fill it to the right level. I should add that I checked it after a drive so the engine and fluids were well warmed up. The last time I checked the PS fluid level was about a year and a half ago when I bought this car. Is a loss of 6 oz over that period of time considered normal or acceptable? Or should I be worried about a leak? Also, while at the store I noticed some of the PS fluids were listed as having "stop leak" additives. I know sometimes these mask the problems instead of fixing them. Are these stop leak additives in PS fluid beneficial or should I steer clear of them? Thanks.