Your Vehicle: 2009 Nissan-Datsun Altima V6-3.5L (VQ35DE)
 
Vehicle » Maintenance » Service Intervals » Severe Service » 18750 MI or 30000 KM  
 
Replace
Engine Oil (S)
Perform at mileage interval or every 3 months whichever occurs first.  
Oil Filter, Engine (S)
Perform at mileage interval or every 3 months whichever occurs first.  
(S) = Service Warranty Requirement
(E) = Emission Warranty Requirement
(B) = Both Service and Emission Warranty Requirement