My "new" S-B45 has an old B&S 2.5hp 'Easy Spin' motor. The filler cap is just that, viz. no dipstick. Do I fill it to just near the top or ? It has square headed sump plugs front & rear, both seem equally worn/used - so to drain I take out both?

And probably obvious to those in the know but . . . is there a "follow this post" button that flicks you an email when there's a reply? tia