I ran it in my old 1985 pontiac. Should I invest in a bottle for my 1994?

No. PTFE has never been proven to be of any benefit, by any other source than an 'independent laboratory'. Duralube is the same.

Stick with a quality dinosaur-based oil, a synthetic blend, or a full synthetic. This is what your car was designed for. Very few additives (mechanic in a can) are worth the money you spend on them.

oh, ok, thanks. I'm not going to put anything in my bonny thats not good for her. I put slick 50 fuel system treatment in my 85 and killed my O2 sensor. The slick 50 for high mileage vehicles stopped the engine in that car (good ol 3.0L) from knocking. I guess just using my synthetic blend oil is my best bet then.

A good synthetic blend (high quality, name brand) is about the best you can do. You get the benefits of a petroleum based lubricant, and the best qualities of the synthetics.

The detergents in the quality oils are critcal for preventing buildup, especially considering how hot these Pontiacs generally run.

I use valvoline durablend, I guess its pretty good stuff

i had a 75 chevy truck that burned oil like nuttin 1 quarts every tank of gas so three cans of motor honey did the trick

Beyond a shadow of a doubt, the synthetics are the way to go, if you look to take care of your car from day one. You really dont know what the "other" guy did. He could have had the oil changed at 3000 mi. intervals, and hopefully did it himself. I know of a couple of "quick change" joints that I wouldnt trust, especially if you request a lower viscosity oil over a higher one. You'll get what they pump in there with their hose. I personally think the slick 50 isnt bad. My father in law had a plane years ago and had told me about it reducing his take-offs by about 200ft. Although I never noticed any power increases, I did feel the car run a little smoother. My 2 cents