i want to know when is the timing belt need to be changed

The 3.5 V6 has a timing chain and not a belt so no special service required.

Nissan has used a cam-chain on all their 4 cylinders and V6s for years. The cam-chain is under the front engine cover and runs in oil at all times. Theoretically, they should last the life of the engine ... but Nissan has had a few issues with their cam-chains and the tensioners/chain guides on a few of their engines.

With altimas have this problem with there cam chain and the tensioners/chain guides

On my 2005 Nissan Altima my check engine soon light came on.i stopped by advance and they put that computer on it. He said my car timing needed the timing adjusted. What do I need to do. It has 212678 miles on 3.5 engine

I just bought 2000 Nissan Altima has 229000 miles on it just change the oil and filter. transmission fluid and filter. It has a sound like The valves need to be adjusted also I took one the spark plugs out it was covered in oil I don't know if that's normal this is This is new to me I'm not used to Nissan also the car sit for about 2 or 3 years . It''s a little four cylinder automatic I'm just looking for any information on these vehicles

I just bought 2000 Nissan Altima has 229000 miles on it just change the oil and filter. transmission fluid and filter. It has a sound like The valves need to be adjusted also I took one the spark plugs out it was covered in oil I don't know if that's normal . This is new to me I'm not used to Nissan also the car sit for about 2 or 3 years . It''s a little four cylinder automatic I'm just looking for any information on these vehicles especially being that high mileage