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That was very helpful, thank you. I don’t put much miles on my Yukon because I mostly use it on highways (road trips) I have a Nissan sedan for city driving. I had it for over 3 years now since it’s new and only put 40k miles. I would try the 5/10W-30 and see. Also I forget to mention that the...

Anyone recommends Shell (they use natural gas instead of oil) over Castrol or Mobil for a GM car?

“I used to run Mobil 1 and the other higher up oil but I have came to the conclusion over the years….it’s all slick”. You’re right and I am starting to agree with this. My warranty has just expired so I am on my own now which is why I care to use the best tools for the car.

You’re right Yes, I am sure they did but I’ve read in this forum (which helped me a lot) that car manufacturers recommend this for fuel economy and sacrifice the engine longevity. I do care about fuel economy but I care more in protecting my car as long as possible.

That’s probably what I’ll do. The 30 seems like the safest bet in all temperatures and it’s widely available and affordable. But Mobil 1 here don’t have this grade here.

Mobil 0w-40

I don't really know how to check for that.

Of course the manual suggests 0W-20 and I’ve followed that (ac delco 0w20) for the last 3 years since it’s new. Last time a mechanic told me I should never use the thin 0w20 since where I live there is no winter and it’s only for US. Our summer is very hot and I mean it reach 50 C (120 F)...