If the recommended oil is SAE30 why would you use SAE 10W30? Some mowers recommend either of these weights but if your recommends 30W then using 10W30 will cause it to use oil.
Yes you can.
yes,it will not hurt it
Use exactly what the manufacture of your vehicle recommends and nothing else. To do otherwise is foolish.
Use Mobil 1 or equivalent.
Yes. 10w30 is recommended but it takes 8 Qts instead of your standard 5 Qts.
10w30
for 4.0l/ 4.7l H.O. use 10w30 for 4.7l use either 10w30 or 5w30 but 5w30 is preferred
Just use what Toyota recommends unless you live in a extremely cold place,then I'd go 0w20 because it flows better in the cold.
10w30
It can vary between 30W and 10W30. L-heads use 30W, OHVs often use 10W30.
10w30 will work just fine in the 2.4L engine.