No.
Synthetic
ATF4+
YES, I have done this with other vehicles. Be sure to use ATF4+ fluid it's synthetic and will flow at the lower temp with out the engine coolant heating.
Yes, it should be perfectly fine to use ATF4 on your 1998 Saturn wagon.
Organic food is better for you because it is not produced with synthetic materials.
Synthetic is better at very low and very high temperatures.
Automatic transmission is a 2004 Jeep Grand Cherokee uses ATF4. Use of other grades of fluid will cause damage to transmission. Addition to answer: The new ATF4 that they recommend is the recommended fluid due to Heat, load, speed and environmental stresses the transmission in these vehicles will undergo. There are other ATF fluids which even exceed the manufacturers ATF4 fluid... meaning they are even better for your transmission. For instance a Hydrotex HyTorque Trans Fluid exceeds the manufacturers ATF4 fluid by ALL specifications. But the original answer is correct, do not put anything of lower value into your transmission or it could cause damage over a long period of time.
full synthetic
Synthetic oil works better in some engines than does petroleum-based oil. Nylon is synthetic.
DEXRON III or ATF4+ is good.
All major brands of full synthetic are good.