Any pros or cons to the "safe" antifreeze brands such as Sierra? When it first came out I never tried it as there was controversy over environmental issues vs whether it would protect the car. It's been years now and there is more than one brand correct?

We have a couple of motors out and wonder if we should take the opportunity to switch over at least on those cars.

No discussion needed on tracks that don't allow AF, that's not an issue here as we do still use the IT cars in the winter so we need it during that time.

I searched the archives for Sierra but.....

TIA,

Diane