Yes you can... regular is 5-30w but if its high millage motor go ahead..
You may use your regular 10W 30.
10W-30
Yes it is fine to use 10W-40 oil
depends how many miles. but 10W 30
10W-30
It is recommended to use 10 W 40 motor oil in a 2003 Chevrolet Tahoe engine. It is also recommended using 10W-30 motor oil in a very cold climate.
No this oil is only to be used in diesel engines. Use exactly what Chevrolet recommends which is not this oil.
10W-30
SE,SFor SG SAE 10W-30 or 10W-40
Mobil 1 10w/30 or Mobil 1 Highmileage 10w/30.
10w-30
5.1qt 10w-30