SAE 10w30 The brand Pontiac put in your car when it was built is impossible to say. They may have been buying their oil from almost any company at that time. Besides it really does not matter. What you use now is what is important. And any major brand is fine.
Use exactly the weight oil as listed in your owner's manual. The brand is your choice an any major brand will be good.
Use SAE 5w40 Full Synthetic any major brand.
what other years trans will fit a 1995 cutless sup. with a 3.1 motor in it
what motor is in it?
Rear main seal.
Motorcraft is the OEM Ford motor oil brand.
SAE 5w30 any major brand conventional or synthetic oil.
change out the bell housing, ECU and motor mounts.. and your good to go
The motor is a 350 and the trans is a 700r4
What year? and what size is the motor?
If it is the 202 motor, then 10-40 synthetic (Mobil brand is recommended)
10w30 Weight any premium brand. I use Pennzoil and highly recommend it.