Exact Antifreeze Brand

[Aurora40]

Originally Posted by Dynomite

Is Prestone Extended Life antifreeze a good selection for the LT5 engine?

In short, no.

Prestone's Extended Life, or "All Makes" coolant is basically a version of Dex-Cool. It is an OAT coolant vs a silicated coolant that was originally spec'd for the LT5.

I could be wrong but I don't believe Prestone makes any silicated EG coolant. The only thing I'd consider is their Low-Tox coolant. It is a silicated coolant like the LT5 came with, but it is made from propylene glycol vs EG. That's what makes it low tox. GM has released TSB's saying PG coolants are fine for use in their cars, but of course they have never done any real certification testing with it.

I run low-tox coolant in my LT5 now. Partly because I can't find any EG silicated coolant, and low-tox I can get locally. Also partly because the car drips coolant sometimes, or at least it has in the past, and I am not a fan of dripping toxins.