I find it easier to measure standing up at a bench. I've done it that way for decades. Other's find it easier to dribble it in and watch the sight glass. We're all happy. No problem.I've never once measured the oil when pouring it in. That is what the sight glass is for. When it's full to the upper dots that is the right amount.
I'll PM my physical address. UPS works better for me. If you send them by mail I have to go to the post office.
I'm not disputing that ZDDP (zinc dialkyldithiophosphate) is a useful anti-wear additive in oil and STP does contain this compound. Too much ZDDP, however, can damage catalytic converters and oxygen sensors. There have also been reports of pitting and spalling of metal parts if the concentration is too high (not sure what constitutes "too high"). I have also read reports where excessive amounts of ZDDP could interfere with detergents and dispersants in the oil. I haven't read any truly scientific studies on any of this so the information is mostly anecdotal. Take Internet research for what it's worth but I have some faith in the petroleum engineers who design lubricants and assume that they know more chemistry and metallurgy than I do! Complicated stuff and it has been studied intensively.
