I run Mobil 1 synthetic 5w-30 in my 2008 Runner since I bought it 5 or 6 years ago with 80,000 kilometers on it. I did my first oil change at the dealer (because there was some whatever power train warranty) and that was a mistake. Mistake in terms of me paying about $150 or so for that oil change. They also used Mobil 1 from jugs at the dealership, FYI.
I buy 2 or 3 jugs of Mobil 1 when I see it being on sale for about 35-40 CAD per jug, so I always have a couple of jugs sitting in the garage when I need it.
The change interval actually varies for me significantly, but almost never less than 10,000 km. I think the longest I went without an oil change was about 16,000 km. Oil is always black, regardless whether i change it at 8,000 or 10,000+, so not sure about the comment that stated the colour is always nice or whatever it said. Granted, black is also a nice colour - my 4Runner is black, lol.
I used to use Toyota filters, but then I ran out (the closest dealer is over 200 km away from me) and used Fram or whatever a couple of times, but then started buying Mobil filters when they are on sale (I buy two at time and always have one available), but do think I am wasting my money. I still use those though and have been for a few years now.
Why one would use something other than the recommended spec is beyond me though, unless "required" by a specific application. Especially using diesel engine oil in a gasoline engine. But to each their own. Usually, "don't try to invent a wheel when one has been invented and tested" works pretty great in practice, try it!
Also, comments like "I used this particular oil/brand of oil for 300,000 in my vehicle" are all completely irrelevant because for the most part "high-end" oil is all the same and there is always another guy who will say the same about another oil/brand.
Lastly, some people say this stuff is cheaper than that stuff. Well, not really. Either you change oil more often or you pay for the consequences down the line. Personally, I don't see myself buying Walmart oil and changing it every 3 or whatever thousand miles. Throw in my time and it costs you more to do so at the end of the day (pretty sure this statement is still true if I don't take my time into account).
OK, I think I am done now, lol.