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For the 2012 Nissan Altima, whether you have the 2.5 L 4-cylinder engine or the 3.5 L V6 engine, you will have a timing chain. Unlike a timing belt, there is no specific time interval for replacing the chain. Timing belts are made of rubber and need to be replaced approximately every 80,000 miles due to wear and tear. However, timing chains are made of durable metal and if well-lubricated by engine oil, they should last a long time without many issues in ideal conditions.
The 2012 Nissan Altima is equipped with a timing chain, which eliminates the need for periodic replacements unlike a timing belt.