1. Where is a cheap place to buy o2 sensors?

2. If the tranny has been replaced via the recall, is there a difference in the newer tranny (heavier duty?)?

3. Does using the autoshift or shifting from d4 and d5 break the transmission sooner or is it ok to do so?

4. I'm only getting about 150 miles to the tank before the light comes on. I'm thinking I could get more by changing the o2 sensor and plugs. Might as well change out the PCV valve, switch to Mobil 1 5/20 synthetic and change tranny fluid. Where is the fuel filter located?

Thanks in advance.

 

One more thing; besides the tranny fluid they sell at the stealership, what else can we use? What grade?