The most reliable source to confirm what coolant your car needs is the official owner’s manual. It clearly states the required coolant chemistry, freezing point rating and recommended service interval.
The vehicle manufacturer designs the whole cooling system together with the coolant formula. Open the maintenance section of the owner manual, and look for keywords like “coolant specification”, “coolant type” or “antifreeze requirement”. This information overrides any guesswork based on coolant color or online casual advice. This rule applies for gasoline, hybrid and electric passenger vehicles.
If you lose the manual, the second fast check point is the expansion tank cap or reservoir label inside the engine bay. Many European and Asian automakers print coolant standards directly there.
European vehicles commonly mark G11, G12, G12++ or G13 codes on the coolant tank. These codes correspond to HOAT and advanced silicate-free OAT formulations. Read the warning text carefully, some tanks also remind users “do not mix different coolant types”. This is convenient for technicians doing on-site inspection.
Vehicle brand and manufacturing year serve as a helpful secondary reference when you cannot access manual or tank labels. Different auto groups have long-standing coolant preferences.
As a general reference: older European cars used G11 HOAT coolant; modern VAG group vehicles adopt G12++ / G13 long-life OAT; most Japanese and Korean passenger cars use silicate-free OAT coolant after 2005; older domestic American vehicles originally used traditional green IAT fluid. Remember this is only a reference, not a replacement for official specs.
Once you know the required specification, verify the aftermarket coolant label carefully, and tell the difference between equivalent replacement and formal OEM approved coolant.
Some aftermarket coolants claim “meets the requirement” which means matching the performance standard; others carry formal OEM approval numbers. For fleet customers and warranty-sensitive repair shops, OEM-approved coolant is the safer recommendation. Gafle coolant products list compatible standards clearly on drum and bottle labels for easy checking.
When you cannot confirm the original coolant type at all, the safest practice is full cooling system flush and refill with universal OAT coolant, instead of randomly topping up unknown fluid.
Adding unmatched coolant blindly is the top cause of cooling system failure. If the history of the car’s coolant is unknown, drain all old fluid, flush the radiator, block and heater core with clean deionized water, then refill a widely compatible OAT coolant. This eliminates cross-formula mixing risk.
Gafle supports B2B auto parts clients with coolant fitment reference materials, helping your team quickly match the correct coolant type for your repair and retail customers.
We organize specification guides sorted by vehicle brand and generation for our wholesale partners. With these supporting documents, your sales staff and cooperating repair shops can answer the question “what coolant does this car need” efficiently and avoid expensive cooling system failures caused by wrong fluid selection.
Welcome to contact GAFLE for more information & cooperation!
peter
ZHEJIANG GAFLE AUTO CHEMICL CO.,LTD
Tel:86-579-8222 1665
Fax:86-579-8246 4690
Cel/Wechart:86-13335993986
E-mail:peter@gafle.net
Web:www.gafle.net
