For those of you who haven't followed in the aditives forum, I've gone round and round trying to degunk my Saab 9-5 since I bought it used back in November. Besides it's rep for sludging if you don't follow strict OCI's of 5k or so with synth, it is also known to have a weeny weak oil pump that wears quickly from the sludgies rolling thru it. Now, I have no immediate reason to suspect anything, but....for future reference, and I know this has been covered in other fashions, but...when wear of the oil pump itself seems to be a motivating factor....would a thicker oil be best to provide a thicker bearing film and raise pressure or would the fastest flowing 0w be the best? Would it be best at that point to bite the bullet and go to say 0W40? Or bite the bigger bullet and just pay for a new pump....? Like I said, no iminent failures I can tell but I just worry it will be an eventuality.