running rich is a bad front 02. But first check your vaccuum lines especially the elbow near the ps pump.
I've finally ordered the front 02 sensor which has been taking too long ship.. been a week. I've been resetting the computer for about 2 years now. But the codes now take 2 days to show up and you can feel the change in the car perfomance, sound a feel. I know when the codes are going to be set before it happens. I tried that o2 fix with brake cleaner and torch. Made it worse. probably the heater element in the o2 was gone.

For the oil part. I hear its normal although mine is clear.

Overall I have no regrets on this car and I think its the best one I've owned.
I've gone through alot of new and used cars.