This is an older thread, but it is also exactly what I was going to ask about. I haven't tinkered with many small engines in the past few years and I guess I've missed some major changes. I just picked up a Remington mower with a Briggs engine. I spent a couple of hours today disassembling part of it, cleaning everything up, checking everything I could, installing a new plug, and installing a new air filter. I got ready to drain the oil and discovered what MowManWV also discovered.
I guess there is a valid reason for them doing this, but it sure is a hassle to do a simple oil change on these engines. Since I'm doing some minor repairs and servicing for customers, as well as buying mowers to refurb and sell, I think I'll invest in an oil extractor kit. I manage to make enough messes on my own without trying to turn mowers and tillers nearly upside down to drain the oil. LOL!