Long time lurker, first post. I'm not asking about the best oil in general, I don't want to burn this thing down lol. Just between these 2 oils. I've searched but not gotten enough of an answer anywhere.
Thank you very much.
Valvoline Advanced Full Synthetic 5W-30 and Castrol GTX Full Synthetic 5W-30 Motor Oil.
I always have a stock of the valvoline in my shop but just got a ton of the castrol for what I think is a great price. I I have all GM vehicles, 1 SUV and 2 trucks. 2020 and a brand new 2025 6.6L gas for towing trailers occasionally. None will get worked super hard. A few thousand miles each per year. Basically of these 2 oils I have what's your opinions of the winner? Just figure I might as well save the better for the new truck. Both are dexos 1 gen 3 full synthetics, so I figure they are about the same myself but i know there are people much smarter than me with this here.Thank you very much.