[Keller]

The bottom line with the oil pressure question: There has been a motor rebuild. No idea who did it, and how well or what parts or specs were used. You are on you're own. The listed oil pressures aren't fatal for a Buick V6, so don't panic. Just make sure you use the proper oil and filters in all future changes.

As for all other non-Engine Mechanical aspects of this question...let's keep those in the appropriate sections of the board, please. I see that this could be a BIG Q&A breeder.

Thanks!