Penrite Red OEM uses organic additive technology with silicate (Si-OAT) based inhibitors that doesnt contain amine, borate, phosphate and nitrite to provide excellent corrosion resistance and to extended service life up to 8 years or 500 000 km, whichever comes first. It is compatible with all plastics, rubbers and seals and will protect all surfaces from corrosion including aluminium and copper. Penrite Red OEM coolant is premixed with demineralised water at a ratio of 1:1 or 50% by volume offering the best coolant performance and corrosion protection. Penrite Red OEM coolant is also safe to mix with compatible types of Type A coolants. The mixing of coolant types and brands is not preferred practice. For top ups, ensure you select the same type/brand of coolant that your vehicle is currently using or select a coolant that is designed to be mixed. If you are performing a complete service or refill, ensure the system is thoroughly cleaned of existing coolant by using a radiator flush. A radiator flush will help remove built up sludge, scale and corrosion while also neutralising any existing coolant left behind, preparing the cooling system for a fresh, clean refill. To find the correct coolant suggested for your vehicle; either add your vehicle to My Garage or check with your manufacturer, vehicle user manual, your local mechanic or head in-store and talk to one of our friendly team.