Coolant conditioner

I've always used NALCOOL in my gas or diesel engines. Works with your favorite Antifreeze. I haven't purchased it in a while, but used to get it at Napa in a White n' Blue plastic bottle. You didn't need to add a lot to the coolant system.  Keeps the systems pretty much rust free. I use it in my Classic Cars & Hotrods cause they sit over the Winter, and I fire em' up once in a while during the Winter months just to circulate the coolant. Some premix Antifreeze's I believe have rust inhibitors added to them now. Cooling system conditioners have come a long way especially for diesels.

Steve@B&B