Have Questions?
Professional-grade parts used trackside.
Expert help during business hours.
Encrypted checkout & trusted payments.
Orders ship quickly from regional warehouses.
DEI Radiator Relief™ 16 oz. coolant additive is designed to effectively reduce engine operating temperatures by up to 30°F, helping prevent overheating during demanding conditions. This advanced formula not only enhances heat transfer within your radiator but also acts as a preventive measure against electrolytic and chemical corrosion, extending the lifespan of your cooling system. Suitable for all radiator materials including cast iron, copper, brass, and aluminum, it ensures compatibility across a wide range of vehicles and cooling configurations.
Radiator Relief™ also includes an anti-foaming agent and corrosion inhibitor that balance the negative effects of acidity over time, maintaining optimal pH levels to prevent core damage. Its formulation reduces mineral deposits and pre-existing scale build-up, promoting a cleaner cooling system and more efficient heat dissipation. This additive is compatible with all coolant additives and anti-freeze mixtures, making it a versatile choice for routine maintenance and preventive care.
Using Radiator Relief™ is simple; just mix 1 oz. per quart of coolant after a coolant cycle and ensure thorough blending with your existing system. It is safe and non-toxic, biodegradable, and non-corrosive, providing peace of mind while safeguarding your engine. This product is recommended for all water-cooled engines and is especially beneficial during extreme driving conditions or heavy-duty applications. Designed to improve cooling efficiency, reduce engine wear, and minimize the risk of overheating, DEI Radiator Relief™ is an essential additive for maintaining optimal engine temperature and overall cooling system health.
Features:
Order Processing
All orders are processed and shipped within 24 hours of purchase (excluding weekends and holidays).
Orders placed after 3:00 PM EST may ship the following business day.
Shipping Methods
Customers select their preferred shipping method and speed at checkout.
Shipping times are determined by the carrier and cannot be guaranteed by us.
Tracking information will be provided once your order has shipped.
Shipping Coverage
If your package arrives damaged, please notify the delivery driver immediately and contact the shipping carrier to file a claim.
You must report any missing or damaged items within 14 days of delivery.
After this time, we cannot be held responsible for lost or damaged items.
Return Window
You have 30 days from the date of delivery to request a return.
After 30 days, we are unable to accept returns, exchanges, or refund requests.
Eligibility
Items must be returned in their original condition—unused, unwashed, and with all tags and packaging intact.
Certain products may not be eligible for return (e.g., special-order items, customized products, or perishable goods).
Items that have been altered, installed, or modified cannot be returned.
Return Process
Contact our Customer Support team to request a Return Authorization (RMA) before sending items back.
Once your return is approved, you’ll receive instructions on where to send the product.
Customers are responsible for return shipping costs unless the item was defective or incorrect.
Refunds
Refunds are issued to the original payment method once the returned item has been received and inspected.
Please allow 5–10 business days for the refund to appear on your account.
In some cases, a restocking fee may apply (if applicable, this will be disclosed during your return authorization).
