In brief: the fluid you use depends on the transmission. The 2008 Altima with the 2.5-liter engine (CVT) uses Nissan CVT Fluid NS-2, while the 3.5-liter V6 version with a traditional 5-speed automatic uses Nissan ATF Matic-S. Always confirm with the owner's manual or a Nissan dealer for your exact VIN.
Understanding the two transmissions in the 2008 Altima
The 2008 Altima was offered with two different transmissions. Identifying which one you have will determine the correct fluid. The CVT is paired with the 2.5L engine, whereas the 3.5L V6 uses a conventional automatic transmission that requires a different fluid.
2.5L Altima — CVT (Xtronic)
For the CVT-equipped 2008 Altima, use CVT-specific fluid that meets Nissan NS-2 specifications.
- Nissan CVT Fluid NS-2 (a fluid labeled to NS-2 specification for CVTs)
Note: Do not use standard automatic transmission fluids in a CVT. Use only NS-2–compliant CVT fluid, and follow Nissan's service intervals for CVT fluid replacement.
3.5L Altima — 5-speed automatic
The V6-powered Altima uses a traditional 5-speed automatic transmission that requires Nissan ATF Matic-S.
- Nissan ATF Matic-S (Nissan’s automatic transmission fluid specified for Matic-S applications)
Be sure to use the correct ATF type for the 5-speed automatic and avoid mixing fluids. If your vehicle has had any transmission work, verify there are no service bulletins that suggest a fluid change from the standard specification.
Additional guidance
Before making a fluid change, identify your transmission type by checking the VIN, door jamb sticker, or owner’s manual. If you’re unsure, consult a Nissan dealer or a qualified mechanic. Never mix CVT NS-2 fluid with Matic-S ATF in the same system.
Summary
The 2008 Nissan Altima requires two different fluids depending on the transmission: NS-2 CVT fluid for the 2.5L CVT models and ATF Matic-S for the 3.5L V6 with a 5-speed automatic. Always verify with the owner's manual or a Nissan dealer and follow the recommended service intervals to maintain transmission health.