You have a 94 listed so rattle is not as common in the later years. Having said that a little rattle at startup should not be a big concern especially if it has sat for a few days or more. My 90 will rattle a little on startup if it has sat and that is with different filters. I also use Mobil 1 filters and oil and have not felt the need to change. I have read Marc's write up but will be sticking with my Mobil 1's for a while at least (I have a few on the shelf)
As to the 10w30, I know several people who have switched for one reason or another and they have not reported any problems.
The bottom line is that you can change filters or the oil, but what you are using is great as well.
