Oil question

QuickDart360 said

I still run 30 weight straight! Currently Brad penn oil. Used to run valvoline vr1 30 wt. Also have a case of Schaeffers 30 wt. So as you can see I'm old skool!! This weight oil works great. Just not in cold weather. Which is almost non existent here in Texas.

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I mostly used 30 straight and race in 30wt and 40wt. But just changed to muti last 5 years or so but got a great deal on it.
Nothing wrong with 30w, 40wt at all.

My dad was manager of the auto section at GEX ( Goverment Employee Exchange ) like Sam's Club
They sold and used mostly straight grade.
We live in the south so mostly hot so most changes used 30wt.
Some asked and used 40wt summer as heavy weight.
Old motors are fine with 30wt and 40wt with no I'll affects, unless built with tight tolerance like a new cars motor
I would not hesitate to use it today