Mixing Peck Sierra & Prestone LowTox Coolant

[T-Roc]

I’m needing to top off my coolant overflow tank on a 2015 Indmar 427SS LS3 motor. The only Propylene Glycol coolant available over the counter in my area is Prestone LowTox which has <.5% Sodium Nitrite. Can the 2 different brands be mixed and will the Sodium Nitrite harm aluminum block/engine parts?

thank you 

[dalt1]

When I added my heater last year, I was told mixing of the Sierra brand I used and the stock Malibu type was compatible.  Prestone was the other option I was given.

[T-Roc]

Thank you dalt1

[dhcomp]

Where are people buying proper marine proplyene glycol coolant?

Struggling to find anything other than the $5 RV antifreeze locally.

Would love to buy at walmart or in 5gal.  Checking walmart today for Lowtox.  

 

 

[TommyTuna]

Hi - wanted to check in and see if anyone knows which brand/make of coolant Malibu/Axis use? Right now my coolant is low and it is a bright green. I can't find anything in stock here in Toronto area other then Prestone Low Tox.  If anyone can point me to the exact OEM coolant that would be great.  Thanks!