The Altima from this era uses Nissan’s Long Life Coolant (LLC), a silicate-containing HOAT coolant, in a 50/50 premixed form with distilled water.
In more detail, the 2008 Nissan Altima requires an ethylene glycol–based coolant formulated to meet Nissan’s Long Life specification. Use Nissan Genuine Long Life Coolant or another coolant that clearly meets Nissan’s LLC/HOAT specification. Do not substitute with non-compatible universal or GM Dex-Cool-type formulations, as these can cause corrosion or cooling-system issues over time. Always verify compatibility on the label and follow the service manual’s guidance.
Coolant type and specifications
Before listing recommended options, note that only coolants meeting Nissan’s Long Life specification (HOAT, ethylene glycol–based) are appropriate for the Altima. The following are acceptable choices if they explicitly meet that spec.
- Nissan Genuine Long Life Coolant (orange/red HOAT), typically sold as a premixed 50/50 solution.
- Other coolants that explicitly state compatibility with Nissan Long Life Coolant or Nissan LL/HOAT specification (ethyene glycol–based, silicate-free, 50/50 premixed). Check the product label to confirm Nissan compatibility.
In practice, most owners use the Nissan Genuine Long Life Coolant or a compatible alternative that clearly meets the Nissan LLC/HOAT specification. Always check the label and your owner’s manual to be sure.
Maintenance and replacement tips
Before listing the maintenance steps, note that proper handling and bleeding of the cooling system are important to avoid air pockets and overheating. The following steps describe a general approach to a coolant change or top-off in a 2008 Altima.
- Ensure the engine is completely cool before opening any cooling-system components.
- If performing a full change, drain the old coolant from the radiator and engine block, then flush with distilled water as needed.
- Mix or pour in the 50/50 premixed Nissan LLC, or the exact 50/50 compatible mix recommended on the product label, using distilled water if you’re blending.
- Bleed the cooling system to remove air pockets, starting with the bleed valves or by following the service procedure in the owner’s manual. Keep the engine running with the heater on high until the thermostat opens and coolant level stabilizes.
- Check for leaks, recheck coolant level after the system cools, and top up as necessary to the recommended level in the overflow reservoir.
Aftercare: Monitor the cooling system for several days after any refill or service. If you notice rising temperatures, air pockets, or coolant loss, consult a qualified technician to perform a thorough bleed and inspection.
Summary
The 2008 Nissan Altima uses Nissan Long Life Coolant (orange HOAT), a 50/50 premixed ethylene glycol–based antifreeze designed for extended service. Use Nissan Genuine Long Life Coolant or an equivalent that clearly meets Nissan LLC/HOAT specifications, and follow proper bleeding and maintenance procedures to ensure reliable cooling system performance.