Sorry, I have been away for a bit. For those that are interested in a quick change valve, you can look up the right one here and purchase it:
http://www.quickoildrainvalve.com/
I cannot comment on how reliable they are given that I am still running the first one I ever purchased about 25 years ago and it has yet to leak a drop or fail.
As regards my drum of Mobil 1, this is actually Mobil Delvac 1 in 5w40. It is actually slightly better than the racing oil formulation. Mobil starting their "Racing" line with a 0W-30. The main characteristic was a high level of zinc dialkyldithiophosphate (ZDDP). Mobil Delvac ESP has both the highest diesel/petrol ratings and is the latest API "CI-4/SL" rated "mixed fleet" diesel engine oil. It also exceeds ACEA's A3 and B3 ( E3, 4, 5 & B4) ratings. It is suitable for high performance petrol engine vehicles. Look it up on Mobil's website FAQ and you will see they think it will perform just fine in a petrol engine:
13. Can Delvac 1 be run in gasoline engines?
Delvac 1 is an excellent gasoline engine oil. Delvac 1 meets the API
SL service classification, which covers most gasoline automobile
engines.
In fact, many owner's of hi-performance petrol engines find the latest generation of commercial fleet turbo-diesel oils to be superior to the latest crop of "best" petrol engine based engine oils. I know several that have used it in their Viper's and Porsche's for years.
Of course which oil to use and what the correct change interval is are not actually the appropriate questions to ask first. The first question is how long you intend to keep your car? If you aren't planning on keeping your car but a few years, it probably doesn't much matter what oil you use in it or how often you change it, unless you have an overbearing conscience and want the next owner to benefit from your oil investments. I did the first oil change ever for one of the secretaries at work that had an old 80's Acura Legend. The car had only 26,000 miles on it, and according to her, she had never had the oil changed. It sure looked it. But it ran OK. Go figure.
The second question is do you bother to warm your donk up? The oil spraying feature of the SRT8's donk helps here, just watch your oil temperature rise quickly (if you set it to see this like I do). Industry statistics indicate that 95% of all engine wear occurs in the first 5 minutes of each duty cycle. For those unfamiliar with a duty cycle, think of driving it to work and parking it for 8 hours, dead cold to OT and back again, a duty cycle. So if you don't warm your donk up much, or at all, the best oil mankind can produce will only provide touchie-feely warmies, or the mechanical advantage inherent with a "Mobil 1" bumper sticker.
And for where I got it? Craig's list back a few months had a listing for 5 such drums. I bought one. It's also an excellent motorcycle engine oil, given it was developed for long-running extreme conditions, and I have it running in my 3 bikes as well as my Dakota.