Rob 
2005 Nissan Altima Sedan 3.5 SE 4dr Sedan (3.5L 6cyl 5M)
Engine Won't Last
 Loved driving the 3.5SE...for four years and 67,000 miles.  Then the timing chain began whining.  Nissan covered the $2,400 repair since it was a known issue (see Technical Service Bulletin).  8 months and 12,000 miles later, I noticed my oil level was low.  Seeing no leaks, I tracked the oil level over the next couple of months. At 89,000 miles, dealer determined that engine was burning 1 1/2 quarts of oil every 1,000 miles! Offered to replace engine for $6,600 my cost.  Nissan refuses assistance since they already took care of timing chain (to me, kind of irrelevant now). This on a car with all scheduled maintenance receipts. Better have an extended warranty or dump car before it's junk.