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Yes, you can use synthetic engine oil in a 2005 Tacoma.
Yes.
Factory fill is semi-synthetic. I would just run full-synthetic.
5W-30, full synthetic.
YesYes
Use 4 quarts full synthetic 10w30.
Not just can, but should. Ford recomends full synthetic for both the V6 Duratec and the I4 Zetec.
mobil 1 5w30 full synthetic
Yes, and you can even mix it with conventional oil.
I switched to full synthetic engine oil in 2001 and have no oil leaks on my 1995 Ford What makes you think you will have leaks? And if you think you will have leaks then why would you use synthetic? You will have no leaks that you would not have with conventional oil.
You can mix part synthetic oil with full synthetic oil.
Mobile 1 Full Synthetic 5W30. It is always on sale at Costco.