[StuM]

I have SPF 1580 and mine has leaked at the bottom of the overflow tank neck where it connects to the engine, since new. I can cut it down to a very small, periodic drip by tightening the attachment bolts, but need to be very careful not to over-torque. I've contemplated removing the whole thing and installing a new thicker, fluid-tight gasket, but it's so small an issue, I haven't done that yet.
Like you, when I look at other similar crs, I find all of them leaking to some extent. Guess it's just they way "God made 'em!"
Good luck.
StuM