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No , the 3.5 litre V6 engine in a 2003 Infiniti G35 has a timing CHAIN
Go to G35 driver.com or craigslist for used.
of Course g35
There's a video at http://www.infinitihelp.com/diy/gsedan/engine_transimission.htm
there was a recall on this part for 2003. If you call your Infinity dealership you can have it replaced there.
Type in G35 Air filter change in youtube and "bythebay" is the one giving the tutorial. Be is reputable at DIYs Do It Yourself videos.
It means you need to change your oil.
It must have a timing CHAIN , because Gates ( they make timing belts etc ) does not list a timing belt for the 3.5 L - V6 in a 2006 Infinity G35
It must have a timing chain . The Gates website does not list a timing belt for the 2003 Infiniti G35
The 3.5 litre V6 engine in a 2003 Infiniti G35 has a timing CHAIN
Its a chain here is a diagram.
The G35 by Infinity comes in both a coupe and a sedan model. So for the coupe the G35 will have 2 doors while the sedan will have 4.