Welcome to the forums. I have an 03 V6. I love it, there is a big difference between the v6 and the 4 cyl, performance wise. I love how mine accelerates. If you are looking into saving gas well you can go for the 4cyl. My v6 gives me between 20-22 mpg, depending on my driving. Now dealing with the trims, there are the 2.5 S, 2.5 SL, and the v6= 3.5 SE and 3.5SL. I dont know if there are more. Now my recommendations, if you are going to buy an altima 4 cyl, go for an 04 and up, because the 02 and 03 had problems with the pre-catalyst and i dont know what else. Now about durability, yes, if you maintain your car well and dont abuse it much, im sure it would last you a long time.
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Current mods: 35% tints, 10000k hids on lows and fogs, Dual 6.5" screen,the free WAI and hope to add much more.
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