How to Add Coolant: Lexus IS250 (2006-2014) - 2008 Lexus Click to view0:33Adding engine coolant (also known as antifreeze) to your 2008 Lexus IS250 is pretty easy. Engine coolant circulates through your engine to keep it cool in the summer but won't freeze in the winter. Make sure to check your engine when it is cold for an accurate reading. Lexus IS250 OE Engine Coolant - autozone wwwzone››Lexus IS250 Fluids And ChemicalsOrder Lexus IS250 OE Engine Coolant online today. Free Same Day Store Pickup. Check out free battery charging and engine diagnostic testing while you are in store.