I dont think so try a robots.txt file on the server. one & done instead of on each page Want to sell the car forum??
What I men is; do I need it? From my understand if you don't have one, spiders will visit your entire site. If you want to exclude certain things then it's wise to have it.
By default robots index your page and follow links, so if this is what you want, you don't need to bother about the robot meta tag. Otherwise you can specify your preference: "index,nofollow", "noindex,nofollow", etc.
Do not use Robots Meta Tag (difficult / quite a hassle to update many webpages and not all Search Engines honor them) Use robots.txt if you want to exclude certain parts of the website.