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oil filters and redline?

I have a couple of questions.
I have been using Castrol 20W-50 on our cars now for awhile and seems to 
do the job.  But I have been hearing the Mobil1 will get rid of the lifter
noise?  Will it?  Is it better?  And would you recommend channging the 
trans fluid with Redline.  I have a 5speed 88 90.  Just curious if it would
help or hurt or do nothing.  Thanks.