Conversation Between turbizzy and reagle80

Hey turbizzy,
It seems like you are pretty familiar with maximas, could you please help me with any info on this issue:
My 02 maxima has 200k (kilometers, not miles, I am in Canada) on it
I did not know about the oil issue until about 2 years ago (I got my car 3 years ago) so I might have ran on low oil sometimes before, even on high rpm.
Since about 6 months ago I found the rattling noise specially under load around 1800-2500 RPM. I can hear it above 2500 RPM sometimes only. About 1month ago SES light came on with P0011 code also, I reseted and has not appeard again yet.
I am very curious to know what could be the cause, i.e. is this a temporary low oil issue or a permanent engine problem? what part you think could be damaged?
Appreciate your help