Re: SAE 30 oil
My guess is it's just a marketing thing and this oil is regular SAE 30.
Well,
He pretty much answered his own question.
I believe HD refers to Detergent level......."high detergent"?
um...no.
HD could be construed as for diesels but in reality, HD (other than marketing) really indicates ANY heavy duty application. Pickups/towing, Marine, Farm equipment, Stationary engine powered equipment, etc.
Oil for diesels has it's own specific API designation.
For anyone that wants to know more about what oil to use,
If you do not want to use the oil recommended by Mercury, Volvo Penta, OMC, GM Powertrain, FOMOCO, John Deere, Briggs and Stratton, Lauson Power Products, Scott-Atwater, and the multitude of others, you can pretty much use whatever you want.
It's all successfully been tried.
If you want to know more, go to :
http://www.bobistheoilguy.com/cms/index.php?option=com_content&view=frontpage&Itemid=1
Every point that has been argued
here almost weekly, in a new oil thread EVERY week, has been cussed and discussed at "Bob is The Oil Guy" til everyone is blue-in-the-face!
Some of these oil threads get heated because for some people (recreational oil-changers) motor oil is an emotional thing!! They feel better when they change their oil!

It IS an effective placebo for some!!!
In every one these threads are people indicating
"what they use, and have never had a problem"
I suppose we need an oil sticky....but as indicated by the number of people that cannot find the "Adults Only" sticky above, most "forum-newbies", would never find it..... and start a new "what kind of oil should I use?" thread.........

And we'd still have weekly oil threads asking the SAME tired (essentially VALID) questions!!
by the way, the oil I use is in my signature below!
Regards,
Rick