iWebTrack - 11:02 pm on Nov 23, 2010 (gmt 0)

Hello -
Currently I am working on optimizing title pages on one of our sites, and I wanted to know roughly how many times I can use the keyword in the title page, like if I do title tag with 60 characters can I say for example:
"car parts | oem car parts | online oem car parts"

Wouldn't that be overstuffing with keywords?
Also, is it better to use commas or | symbol in the title?
Please let me know your opinion, every advice is appreciated.
Have a nice day