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For your 2007 Toyota Tundra, it is recommended to use red or pink long-lasting coolant specifically formulated for Asian vehicles by Toyota. Avoid mixing different coolant types in your truck as it can cause internal damage and rust within the cooling system, potentially reducing its effectiveness. If you're low on coolant and uncertain about the type currently in your vehicle, it's safest to top it up with distilled water temporarily. This will not harm your system and allow you to drive until you can identify the coolant in your radiator and cooling system.
The 2007 Toyota Tundra works with these coolants: Peak OET Antifreeze/Engine Coolant PAR0B3 and Peak Original Equipment Technology Asian Vehicles Extended Life Red/Pink Antifreeze.