Use Synthetic For Best Protection
Absolutely make the switch. The Magnusson-Moss Warranty Act ensures your warranty will not be voided by switching to synthetic oil.
As for intervals with Mobil1, anything less than 5K is wasteful and you should seriously consider going the full 7500. That is the maximum interval in your owner's manual and therefore the maximum Exxon/Mobil will stand behind.
FWIW, my 2002 Tundra is around 21K miles now -- the last 19K or so on the same oil...
Also, be sure to use a good oil filter. The Mobil1 filter is good but the Purolator Pure1 is equivalent in filtration efficiency at about half the cost... Only use the superior AMSOIL filters if you extend your drain intervals to make them cost effective, even though they cost less than the Mobil1 filters do.
Regards,
~ Fred
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