I have a 98 Chevy s10 pickup 2.2L 4cy I drive daily about 30-40 miles it has 89K miles on it I was wondering if Castrol GTX 5w30 would be a choice for application
It seems like most folks on here are not too crazy about GTX. I have used it without issue for many years and over a million miles and would not hesitate to use that oil in your application.
Any SM rated 5w30 conventional will serve you well, especially if your changing it so frequently. If your engine is running well there shouldn't be any reason you can't go up to 5K OCIs. As for me, I prefer Pennzoil, Quaker State or Valvoline.
Valvoline will be a little better in the cold conditions (you can use it to below -5 F without much concern), and it should be close in the hot.
At temperature, all SM conventional oils are pretty similar unless you see extremely high oil temperatures like from towing or high speed running in high temperatures. The only one that really bucks the trend for cold performance from the rest for brand name oil is GTX.