Engine winterization

[HALF FAST]

I have Yanmar power in my boat. The heat exchangers are bronze, the inter cooler appears to be cast aluminum. Until now I have been using automotive antifreeze for winterization. My local automotive supply carries "Splash" RV Marine drinking water system antifreeze. It states OK for brass& mild steel. Should I be concerned about aluminum not mentioned? Are there any other economical substitutes?

[yottyboy]

Continue to use automotive antifreeze. I'd consider the silica free "orange" stuff as it won't cause any issues with your aluminum.

[HALF FAST]

Thanks for the advice Bill.

[LI32]

Starbrite makes "Winter Safe" a -50 RV antifreeze that says it is 100% safe for aluminum/brass/copper/steel. Also the Starbrite PG -100F makes the same claim - that is the product I use for my diesels - $10/gal - I need 15 gallons for two engines and the generator. Haven't used the Wintersafe product. In the water system I usually mix 9 gallons of -50 with 3 gallons of -100 - which results in 40% PG and protection to -6F; I use the same mix for my gas engines