The Verano requires Dex-Cool, GM-approved extended-life coolant (orange). It should be mixed 50/50 with distilled water, or you can buy pre-diluted Dex-Cool. Use only coolant that is explicitly labeled as Dex-Cool or GM-approved Dex-Cool-compatible.
In practice, follow the owner’s manual or ask a GM dealer to confirm the exact specification for your model and engine variant (base 2.4L or the turbo), but Dex-Cool is the standard recommendation for this generation. Avoid mixing Dex-Cool with conventional green coolant or with any non-Dex-Cool formula unless a professional flush is performed first.
Coolant specification and what to buy
Buick/GM engines from this era are designed to run on a silicate-free, organic acid technology (OAT) coolant. The familiar orange color identifies Dex-Cool, GM’s extended-life formulation. You can purchase Dex-Cool in concentrated form and mix it 50/50 with distilled water, or buy pre-diluted Dex-Cool ready for immediate use.
- Dex-Cool Extended Life Antifreeze/Coolant (orange, GM-approved, OAT).
- Dex-Cool-compatible HOAT coolants that are explicitly labeled as Dex-Cool compatible and silicate-free.
- Pre-diluted Dex-Cool, if you prefer not to mix concentrates.
Concluding: For a 2013 Buick Verano, use Dex-Cool or a GM-approved Dex-Cool-compatible coolant, and mix at 50/50 with distilled water unless you’re using a pre-diluted product. Always ensure the product explicitly states Dex-Cool compatibility to prevent mixing incompatible formulations.
Mixing, capacity, and maintenance tips
When adding or changing coolant, start with a cool engine. If you’re using concentrate, mix it with distilled water to a 50/50 ratio. If you’re using pre-diluted Dex-Cool, simply fill as indicated on the bottle. Do not mix Dex-Cool with green or other non-Dex-Cool coolants unless a professional flush has been performed and the system is prepared for a compatible blend.
Check the vehicle’s cooling system capacity and service intervals in the owner's manual or with a GM dealer. If the coolant shows signs of contamination—unusual color, grit, or a sweet odor—or if leaks are present, have the system inspected and flushed as needed.
Summary
The 2013 Buick Verano relies on Dex-Cool Extended Life Antifreeze/Coolant (orange, GM-approved). Use a Dex-Cool-compatible coolant and mix in a 50/50 ratio with distilled water unless you’re using a pre-diluted formulation. Avoid mixing with non-Dex-Cool coolants, and follow the official maintenance guidance for the exact capacity and service intervals.