regular or synthetic oil

[rockford0384]

Alright my car has 149xxx miles on it. Its a 97 gtp and Im not sure if i should put synthetic in it or regular oil in it. I want to change the oil and oil filter for my trans. I have about 9 quarts of synthetic oil (maxlife dextron 3). Ive been wanting to put it in but im scared it might screw it up. I hate soft shifts... and im affraid this stuff might make it shift soft. It says for higher mileage vehicles. But highly not recommended not to use in new or rebuild trans's.
let me know what all your opinions are.

[Ripn12s]

If your talking bout the trans fluid then stick with the stock fluid. The Syn. will be to slippery, and you'll more then likely start noticing the trans slipping.

[GTPJeff]

If it's dextron 3, weather it's synthetic or regular tranny fluid.. It has to have a specific coeffecient of friction..

If you've got the fluid already, put it in.. It won't hurt.. But synthetic tranny fluids greatest claim to fame, are their shear strenth, and resistence to heat.. Unless you're racing or towing sythetics can be cost prohibitive...

Or, if your like me and only want the best for your baby.. You'll use synthetics through out ..

[kilroypr]

I agree, Always has been said that syntethics have more resistance to thermal breakdown and longer usefull life, meaning, will behave as expected on a larger high temperature expectrum. And it is correct, whether is type F, ATF, Mercon 3, Dexron, Dexron/Mercon 3, etc, does not matter if syntethic or not they must have the same viscosity/friction specs than the std petroleum based oils. I was told once tought that the european syntethics are somewhat better because they are based on Graphite or similar materials and not necesarilly petroleum