2002 Nissan Altima 2.5 SL 4dr Sedan (2.5L 4cyl 5M)
Only consider purchasing a 3.5L engine do not buy a 2.5L 4 cyl lemon!!! These engines have problems with pre-cat manifold, bolts from intake manifold can potentially enter the cylinders, crank/cam position sensors go bad, heating/AC problems. Other then that the car is great, really liked brakes and suspension, and gas mileage which varied from 21 to 27mpg. I bought the car around 75k-80k miles and it was already loosing oil since I fortunately noticed it right away after I bought it. Car had pre-cat replaced under warranty right before I bought it but the damage to engine from intake bolts or pre-cat was already done. The car mysteriously was losing 1qt of oil every week, after full
brakes and suspension, and gas mileage
diagnostics from Nissan which showed the engine running at 100% with no error codes and compression being good in all 4 cylinders, oil still disappeared at rate of 1-2 quarts per week. Finally traded it back to Nissan at around 90k miles and of course I didnt mention about the oil. Good luck.......