Hello everyone!!! I'm new to this forum. I need some advice on brands of oil that I should use. I live in Tucson AZ. I drive a Chevey S10 that takes 5w-30,with 6000 miles on a rebuild engine.It's mainly driven very short trips every day about 4 miles dayly. A 04 honda crv with 112k miles that takes 5w-20.this car Idles for long periods of time in the 105 degree heat.Obviosly the 2 autos are under severe conditions.I use Castrol GTX for both & purolator filters.I'm not all up to speed on the spec #s and what they mean and older data.With so many brands out there and every brand says they are the best,synthetic vs. dinno.Ive reserched online to the point now I'm more confused now.What type of oils would you use and why?I'm not talkin brand X cause thats what my Pappy uses and it's the best,or Ford vs. Chevy [censored]. Any help and in put is greatly apreciated. Thanks.