I have run many oils in my Magnas..
Amsoil, Valvoline M/C oil, Rotella T6..
I've been running T6 for a while with no issues (5 years plus)...
The real questions are.. How many miles do you ride in a year and how often do you change your oil?
I change my oil once a year.. I have been putting between 5-8K per year on my bike (when I had only one).
The handbook calls for oil changes at 7500 miles.. (that is considering dino conventional oil)
Here is MY rules.. IF you put on more than 6000 miles/year, it's probably worth going synthetic (T6)
IF you do between 3.5-6K miles per year, then you could go Semi-Synthetic (T5).
If you put below 3500 miles per year, then you could just run conventional..
I know I get to ride 8-10 months per year (a lot of rainy days during the summer)
Number of miles is NOT the only considerations.. You have protection of internal parts, and other considerations.
IF the bike sat a lot, I would consider a true M/C oil, which MAY have more anti corrosive / rust properties. I know Amsoil is great for this..
So.. , as with all oil threads on M/C sites, In the end.. It's more a matter of choice, preference, comfort level than any other factor.. I know people that use Synthetic, change there oil every 3K miles, or 6 months.. They have the $$$, but I'm not sure what EXTRA benefits they are getting besides their own piece of mind...
BTW - I use Purolator PureOne PL14610 oil filters.. In a test that was run several several years ago, it had great filter media and reasonably priced. I recently heard that someone didn't like this oil filter because of the "burst" rating. I do not ride my Magna easy and have never had an issue with this filter.
The Purolator PureOne PL14610 is a slightly longer than stock oil filter (a bit more oil for cooling and slightly reduced recycle period for the oil.. IF you want a stock sized oil filter you can use the Purolator PureOne PL14612 oil filter.
I do take the time to paint mine silver with BBQ paint.. Nether the color nor the heat rating is probably necessary, but I like the comfort it gives me.
I hope some of this helps
BTW, I run T6 in everything I've got.. 2 Magnas, 2 Victories, Honda CR-v, Hyundai Sante Fe V6, Lawn Mower..
I haven't had an issue in any of them.