This funnel is very good for pouring additives in most cars with filler necks high on the rear fender.  The "splash guard" or offset flare makes it simple to pour without splashing, or trying to pour almost sideways as would be necessary with a typical funnel.  I was using one of those flexible 'accordion' funnels to get a more vertical pour, but the ribs, or convoluted part tends to trap a little of whatever you're using and may cause cross contamination.  I found this funnel to be very ergonomic and undamaged by any fluids that are usually found in a garage.