Hello everyone, I just picked a '94 940 with 211K miles as a new vehicle for my wife. This is my first B21/B23 redblock car so I am trying to gather as much information as I can on the maintenance of this car. So far it has been running great and I want to keep it that way and I am certainly willing to put in some money now to guarantee a relatively trouble-free future...it is my wife's car after all. I have been looking through the 900 series FAQ on this site and I have got a lot of great tips from this list:

http://www.brickboard.com/FAQ/700-900/HighMileageVehiclePrevMaint.htm#Preventive_Maintenance_After_Purchase

I am going to work down the list and get this car to stage 0. I had just a couple of questions to start out:

1.) Currently the car running on standard dino oil (Castrol GTX)...is it worthwhile to switch this engine to Mobile-1 this late in its life? I run Mobil-1 in my V70 so I could use the same oil in this vehicle easily.

2.) The car has a small "lump" or hunt at idle (only +/-100 RPM) so I was planning on cleaning out the Idle air circuit and throttle body. Any other major areas to look at here?

3.) Any other recommendations from forum goers on things to check/preemptively replace? Any other parts that would be good to have on hand?

Thanks in advance!
Brian