Tractor Supply sells Briggs & Stratton pump oil for about $5 for a little less then a quart. It is identical to this stuff the only difference being the container size. The stuff offered here is for powerwashers whose sump holds 4.6oz of lubricant. Is that a problem? No. The sump on powerwashers is normally completely filled to just about the bottom of the filler plug (in other words they can only hold 4.6oz when filled). It's pretty much impossible to overfill them. Now go to TSC, by your B&S pump oil there and save some money. And if you don't believe any of this call B&S's 800 number and they'll confirm it for you.
This is a 5 star item, the only problem is that the 4.6oz size is waaaaay too expensive.