I changed my oil at 1,000 miles and 3,000 miles with conventional oil, and I will change it again at 5,000 miles with either another conventional oil or a synthetic-blend. At 10,000 miles, I will switch to a full synthetic oil.
This is just me, though. You will hear all sorts of opinions, and none of them are wrong. People will point out that many expensive cars are delivered with synthetic oil from the factory, while others will say that conventional oil should be used during break-in in order to aid in the seating of the rings. Who knows?
I just figure that I would play it safe by waiting to switch to synthetic in case there is something to the notion about waiting until after break-in. In addition, I should be at 10K miles just as winter starts, so I will get the synthetic in the crankcase before the cold weather, which is when it may be most advantageous to use synthetic.
Mobil 1 EP did not meet the most current SM/GF-4 and API "Energy-Conserving"specs when it first came out, so it probably wouldn't have met Toyota's warranty requirements. However, I believe it has been re-formulated to now meet these specs. Originally, it had a more robust add-pack that met the older SL spec. Apparently, the SM spec is more environmentally friendly.
You can't go wrong with Mobil 1, Mobil 1 EP (SM/GF-4 version) or Mobil 1 Truck & SUV 5W-30, especially while under warranty. There are other good synthetics out there too (Amsoil, Castrol 0W-30, Redline, etc.), but they may be more expensive and harder to find. Pennzoil Platinum is a great deal when there is a rebate promotion going on. Just be sure they meet Toyota's requirements while under warranty.
I would recommend Toyota OEM, Wix, or Purolator Pure One filters. If money is no object, I would throw in Mobil 1, Amsoil and K&N Gold filters too. If you are on a tight budget, I would go with Purolator Premium, Motorcraft or Supertech (Wal-Mart) filters. I would avoid Fram filters.
The most important thing to do while your vehicle is under warranty is to change your oil every 5,000 miles or six months, whichever comes first. Keep all of your receipts and keep a maintenance log in case you need proof for a warranty claim.
With such a maintenance program, you will not have any lubrication-related issues for as long as you own your 4Runner.
P.S.
Mobil Clean 5000 is not a synthetic blend, but MC 7500 is.